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The phenomenon of twilight has been stipulated as naturally dependent on the variables of solar depression, aerosol concentration and ozone composition. The unique color spectrum of twilight is attributed by ozone layer and aerosol, whereas its brightness is heavily relying on the altitude of sun below horizon. While all the natural dependence is being researched extensively, the impact of light pollution on the brightness of the twilight is not being explored thoroughly. The objective of this study is to find out the alteration of light pollution towards the natural behavior of twilight sky brightness. Total of 84 data of twilight brightness was collected from 2014 until 2022 using Sky Quality Meter, and the specific location with profile classified as urban, suburban and pristine is investigated to study the impact of light pollution on twilight brightness. The result demonstrates that the stability of twilight brightness, which naturally factored by solar depression within the range of 18°, discovered to be heavy influenced by the zenith light pollution of the location sky, as evidenced by location that has zenith pollution of 17.11, 19.77, and 21.39, has horizontal twilight brightness of 14.84, 19.55 and 21.2 and solar depression during brightness stability at 11.5°, 15.67° and 17.49°. [ABSTRACT FROM AUTHOR]

Abstract The phenomenon of twilight has been stipulated as naturally dependent on the variables of solar depression, aerosol concentration and ozone composition. The unique color spectrum of twilight is attributed by ozone layer and aerosol, whereas its brightness is heavily relying on the altitude of sun below horizon. While all the natural dependence is being researched extensively, the impact of light pollution on the brightness of the twilight is not being explored thoroughly. The objective of this study is to find out the alteration of light pollution towards the natural behavior of twilight sky brightness. Total of 84 data of twilight brightness was collected from 2014 until 2022 using Sky Quality Meter, and the specific location with profile classified as urban, suburban and pristine is investigated to study the impact of light pollution on twilight brightness. The result demonstrates that the stability of twilight brightness, which naturally factored by solar depression within the range of 18°, discovered to be heavy influenced by the zenith light pollution of the location sky, as evidenced by location that has zenith pollution of 17.11, 19.77, and 21.39, has horizontal twilight brightness of 14.84, 19.55 and 21.2 and solar depression during brightness stability at 11.5°, 15.67° and 17.49°.

This study investigates control options of a daylight dimming system in an open-planned office for required lighting environments with lighting energy savings and acceptable glare ratings. Computer simulations were performed for photosensors with three ranges of viewing angles in two daylit perimeter zones of the office and consecutive computational processes based on dimming control algorithm were employed for final light output of lighting fixtures. Three CIE standard sky and blind conditions were employed for the prediction of indoor daylight illuminance, photosensor illuminance, and daylight glare probability (DGP). The results indicate that the perceived glare can be imperceptible for the majority of time periods and a daylight dimming control system can be effectively applied for perimeter zones of office with curtain walls. For the south-facing zone under clear and intermediate sky conditions, the horizontal and 45 degree blind conditions are recommended to be combined with the full or partial photosensor shielding conditions for desirable dimming control performances. The unshielded photosensor condition should be generally avoided. For the east-facing zone under clear and intermediate sky, the photosensor sensing range should be narrowed using full shielding for the improvement of system performance of daylight dimming control. The unshielded and partially-shielded photosensors are rarely recommended. For the east and south-facing zone under overcast sky, effective control performance was rarely achieved due to the lack of daylight. Predictions models for linear relationships between the workplane and photosensor illuminances due to daylight were statistically acceptable, and strong relationships existed between them.

Most measurements of the diffuse light of the night sky to date consider only the intensity of the light field, and current models can successfully reproduce these measurements. However, this approach is incomplete as it overlooks the polarization state of the light. Few measurements (and no successful models) of night-sky polarimetry appear in the literature. We present a new model of night-sky polarization that successfully reproduces observations in a heterogeneous environment and for a real distribution of finite-sized light sources over the intermediate region surrounding the observer. The model compares favourably with field measurements made in Slovakia in 2021 May. The results described herein help advance understanding of the angular distributions of artificial light at night from ground sources and the relative contributions of sources to the overall brightness of the night sky. [ABSTRACT FROM AUTHOR]

Copyright of Bulletin of Ablai Khan KazUIRandWL: Series 'Philological sciences' is the property of Kazakh Ablai Khan University of International Relations & World Languages and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

There are many reasons associated with stress, long term stress induces neurological and psychosomatic disorders like hypertension, hypothyroidism, diabetes, anxiety and depression which affect the lifestyle of human beings. Consequently, behavioural activity and action gradually change in their surrounding environment and also perceived by others. In general, stressful respiration is relatively different from normal. To release stress and control all the neuropsychological hormones, multiple activities like playing games, watching a movie, listening to songs and music, etc. or intake of medicine/drugs such as (Allopathic /Homeopathic/Ayurvedic) are used. Medicines can provide easy stress evasion, but relief is only temporary. Thus, yoga and Sudarshan kriya (SK) meditation is a unique and alternate therapy identified by Gurudev Sri Sri Ravi Shankar by Art of living. It would be a healthy way to get rid of stress in peoples’ lives. Study of long-term effects of (SKY) Sudarshan kriya Yoga before and after and response of the brain regions in experienced (10–15 yrs) practitioners, mediocre (3–5 yrs) and novice(non-practitioners) is the main objective of this work. This study is planned in three phases, the first phase is an experiment on SKY practitioners for more than 10–15 years, in which their (EEG) Electroencephalogram is recorded just after a session of meditation and the common portion of excitation amongst the three subjects is mined and analysed, to draw inferences. This inference would help us draw a conclusion about (BLOC) base level of consciousness considered as benchmark. In the second phase, comparison of benchmark data with the Mediocre (3–5 yrs) measurement and in third phase, benchmark versus Novice data, is done. Next is the phase of interpretation of the response in the form of EEG spectral waves as Type I- 10 to 15 years SKY Practitioners (Superconscious), Type II- SKY practitioners 3 to 5 years (mediocre/semiconscious) and Type. III- Non-practitioner subjects (Novice/Un-conscious). The unconsciousness here means a state of complete unawareness of the self, though conscious of the external, physical world. Thus, power spectrum analysis (PSA) is carried out and frequency of each electrode is computed through segment analysis, Power Spectrum Density (PSD), Correlation coefficient, Mean and Standard Deviation, for finding the level of consciousness. The spectral waveform of these recordings is analysed programmatically using machine learning techniques (used Python Language run on the Jupyter notebook, Spyder, Google colab environment).Frequency analysis results are obtained by placing 21 electrodes in human brain in different lobes that is (Fz, C2, P2, FP1, FP2, F3, F4, C3, C4, P3, P4, O1, O2, F7, F8, T3, T4, T5, BP4, E.G, T6) those are frequency measuring electrodes/channels placed on the frontal lobe, temporal lobe, parietal lobe and occipital lobe over skull and brainwaves alpha (α)[8–12 Hz], beta (β)[12–16 Hz], delta (δ)[0.5–4 Hz], theta (Θ)[4–8 Hz], gamma (γ)[16–32 Hz] are synthesized. The interpretation of these analyses suggests alternative therapeutic techniques, to improve both mentally and psychologically and thus become socially acceptable. [ABSTRACT FROM AUTHOR]

The passage from pseudo-Seneca, Hercules Oetaeus 1905-1908 describes how Hercules briefly replaced the Titan Atlas in his duties supporting the Sky. However, the poet refers to Olympus, characterizing it with an epithet that does not belong to a mountain but to the sky. In this way an equation is created between these two places, mountain and sky. What is noteworthy in the passage of pseudo-Seneca, however, is not the general use of Olympus as a synonym for the sky, but the use of a designation of the sky for Olympus that completes the image of the identification of Olympus with the sky. Such mixing of adjectives is and remains rare as evidenced by the intertextual analysis attempted in the article. Moreover, mythology also mentions that Atlas holds the heavens forever (Hesiod, Vergil). It therefore follows that verse 1907 should be translated as 'of the starry sky' and not 'of starry Olympus'. [ABSTRACT FROM AUTHOR]

This paper presents the novel simultaneous observations of plasma blobs, MSTIDs and plasma depletions in OI 630 nm all sky airglow images over Srinagar, India (34.1 °N, 74.8 °E) during the night of July 29, 2019, obtained using an airglow imager. Notably, the MSTID bands that followed the plasma blob interacted with a plasma depletion structure and suddenly disappeared, resulting in a reduction in the intensity of the plasma depletion. The SWARM satellite observations during the airglow observations indicated the occurrence of the plasma blob event and showed the conjugate appearance of MSTIDs in both hemispheres. The ROTI maps indicated the absence of EPBs but the occurrence of irregularities near the transition zone just before the presence of plasma blobs in airglow images and at the time of plasma irregularity detection. These observations suggest potential interactions between these phenomena, indicating that the presence of one impacts the other. This paper discusses in detail the observed ionospheric features and time evolution of the occurrences of these events, in addition to their interactions.Utilizingthe satellite observations, including SABER, INSAT-3DR and AIRS, the presence of deep convective clouds and upward propagating gravity waves near the location of the plasma blob is demonstrated, suggesting that convective-generated gravity waves could possibly trigger the formation of plasma blobs. [ABSTRACT FROM AUTHOR]

Weakened by the expansion of several imperial and colonial projects, the inhabitants of Jabal 'Amil survived as second-class citizens, severed from the urban expression of Lebanese nationalism, and having to formulate their identity amid countless transgressions on their scholarship and literary production. It is thus in the spectacles of the universe and the mysteries of the cosmos that they inscribed fragments of their oral legacy, turning the night sky into an archive that no empire could burn or colonize. And yet it is light pollution, leaking from the same cities they were once forced to nourish, that quickly established itself as the main transgressor, clearing the faintest stories in their celestial library. Although distant manifestations of Islamic cosmology could no longer animate their rural nights, new alterations in the sky after dark, no matter how violent, have proven worthy carri-ers of their modern myths and legends. And it is onto the loudest object in their polluted sky, the Israeli reconnaissance drone IAI Searcher MK, that they grafted the tale of their legendary matriarch Umm Kamel. I argue that Umm Kamel's physical and symbolic ascent into the sky was orchestrated by a modern generation of 'Amilis whose infidelity to the celestial stories authored by their ancestors fortified their ability to transform the combined pressures of pollution and colonization. United by their efforts to forge new imaginaries around a starless night, they invite reflection on the possibility (and responsibility) of confronting the sky we have together inherited rather than lamenting the one we have lost. In tracing Umm Kamel's transformation from figure to constellation, I contend that their cosmic interventions set the stage for new alliances between design and darkness, and ultimately, for a more expanded imagination of night design, particularly within the context of the climate crisis. [ABSTRACT FROM AUTHOR]

Knowledge about regions where lightning occurs is important both for understanding storm development and direction. This can assist in very short-term weather forecasts and in developing lightning warning systems, aiming to minimize exposure of people and equipment in the open sky. A survey on the occurrence of lightning in different types of land use and coverage and different elevation strata in the region of the Itacaiúnas River watershed (IRW), located in the Carajás Mineral Province, in the Eastern Amazon, from 2012 to 2021 was conducted. The results showed significant differences in the occurrence of lightning in mining areas and deforested areas. When comparing the large proportion of deforested areas with the mining area, the results suggested that in IRW mining areas, the lightning incidence is expressively higher. The assessment of electrical activity at different elevations in the region suggested that the slope of the terrain and its thermodynamic effects on the formation of storms have more influence than altitude on lightning activity. The results showed the importance of adopting initiatives aimed at protecting both the local population and mining workers, as well as equipment exposed to the open sky in this region. [ABSTRACT FROM AUTHOR]

In the Persian language, "Sar Panah" (in English, shelter) is a common word used for house. The purpose of a shelter is to protect humans. This compound word consists of two words: Sar means authentic and up, and Panah means a protector. This means the house mainly protects a person and guards his head and value from the outside, including atmospheric factors such as wind and rain as well as the dangers of the earth and its creatures. The common ground of the two hidden meanings in the word "head" signifies the high spiritual rank, geographical location, and a place of refuge. The concept of "Panah" is also associated with protection and enclosure. Therefore, shelter is expected to be the name of a structure characterized by introversion and isolation to protect others, highlighting perfectionism and meaning-seeking. This output is the structure that derives from the term shelter. This process ends in a dense, closed, and introverted structure that is completely shut off from the outside, whether the neighborhood or the environment. However, the analysis of the evolution of the house in Iran is different from this process. Not much exists on the early samples of Iranian houses and shelters. Scrutinizing early samples of settlement in Iranian caves such as Krafto in Kurdestan shows that the concept of "Sar Panah" has been equated to enclosed space, interconnected, narrow, and separated from the surroundings.Investigation into the oldest archeological site in the prehistoric period, including Shahr-e-Sokhte-y-Zabol (in English, the burnt city of Zabol), with a history of 5000 years confirms that the house and shelter have been conceptualized as before. The houses include narrow and dark spaces attached (for protection purposes), covered, dim, and void of any big opening outwards. The protective role of the house and its enclosure equates to isolation from the outside, which could be apart from the neighborhood or the environment. Examining the houses over a thousand years in different historical periods, including Median, Achaemenid, Parthian, and Sassanid, based on the documented physical and spatial changes, shows the first philosophical leaps in the definition of home and shelter compared to the previous era. Despite the technical changes in the construction and size of the house, which mirror a perfected achievement over time, the emergence of new organs in the architecture of the house presents a new conceptualization of shelter in this era, among which there is a central courtyard along with iwans. Opening the heart of the house towards the sky, closing it from four sides, and forming its spaces is the most heartwarming reading of the new concept of shelter. In this interpretation, isolation from nature and the sky is not an example of being sheltered any longer. Rather, it represents a special connection with the upper world or heaven, which not only is not misaligned with the concept of protection but also reflects an evolutionary relationship with the sky, which describes the house under its protection. This approach, which has gradually shaped the original pattern of Iranian architecture, has continued until the contemporary period. The initial samples can be seen in the Zoroastrian house in Jandaq and Mazra eh Kalantar in Yazd.The pattern of the central courtyard was improved, and different patterns emerged across Iran. Early samples in hot and arid areas included changes in some parts of Chahar-Soffeh houses, whose central opening, which sometimes includes the stem of an open dome, is a small courtyard that frames the sky.The residents of this house cohabit with the sky in an enclosed space compared to the surroundings. The selection of blue color for the domes in the main space of Iranian architecture seems to be associated with such a landscape. The popularity of the aesthetic combination of khaki and blue colors in Iranian art can also be associated with such space creation.The Iranian aesthetic system hinges on the pattern of the central courtyard, whose idea was linked with living space and home and then was extensively used as an essential and inseparable part of architecture. Shortly, this pattern was adopted in the spatial system of schools and caravanserai, mausoleums and mosques, gardens, and prisons. Iranian architecture is shut off from the neighborhood and open to the sky.Outside the village named Cham near Yazd, at the foot of the hill on which the Zoroastrian Dakhma (tower of silence) is located, a complex has been built to bolster the ceremonies and rites of commemoration of the dead. In a part of this pristine complex, there is a Chahar-Soffeh house, in the middle of which an open dome base connects the four iwans of the courtyard where nothing but the sky alongside the residents can be found. Repetition of such a landscape, while the purpose of a house is to create a shelter with all its complex and perfectionist concepts, has contributed to specific Iranian aesthetics in house architecture, which equates beauty to the presence of the sky in an enclosed space. The contrast created by coexisting openings and enclosures has contributed to the attractions of the Iranian house.

The nocturnal feeding behavior and zoogeographical habitat of cookiecutter sharks Isistius brasiliensis and Isistius plutodus (Isistius spp.) greatly reduces interaction of this species with live humans. Attacks on live humans are exceedingly rare with 7 cases reported worldwide, 6 of them in Hawaiʻi, and 5 of these occuring among channel swimmers. Published research suggests that periods of bright moonlight may increase Isistius spp. contact with live humans and does not otherwise identify significant trends or risk factors. Yet 5 of the 6 Isistius spp. bites on live humans in Hawaiʻian waters occurred with the moon set and after nautical twilight end and before nautical twilight start. From 1961–2023 in Hawaiʻi, 129 successful solo channel crosses and 5 Isistius spp. related injuries in the habitat of cookiecutter sharks were analyzed across two groups: one where both the moon and sun were set (dark group) and one where the moon and/or sun was in the sky (light group). There was a significant difference for swimmers bitten by Isistius spp. in the dark 4 (12%) versus light groups 1 (1%), p = 0.012, RR 12.6 (95% confidence interval: 1.5–108.9). Swim start time and year was also significant (Pearson correlation 0.566, p <0.001). Swimmer gender and use of shark deterrent devices and artificial illumination were not significant. The growing popularity of channel swimming in Hawaiʻi and swim start times have contributed to an increasing likelihood of live human and Isistius spp. contact and a moonless night sky is a significant risk factor for this interaction. [ABSTRACT FROM AUTHOR]

Sky subtraction is a crucial step in the data reduction process for LAMOST, including dark, bright, and grey nights. During the pilot survey, on bright nights, atmospheric scattering of moonlight can introduce gradients in the sky background. In observations during bright moonlit nights, the sky component is significant, and sometimes, variations in colour can be observed in the sky spectra. This phenomenon is not universally present during observations on bright moonlit nights. Taking this into consideration, this paper proposes a weighted trend-surface method to reconstruct the sky component within the science target fibre, aiming to achieve the subtraction of the sky component. We constructed a sky model using a trend surface, utilizing data from all sky fibre spectra on the same spectrograph to predict the sky component for each fibre spectrum. Subsequently, the reconstructed sky spectrum data were compared with the actually observed sky spectrum data and the 'super sky' from LAMOST's pipeline. The results indicate that our method is closer to the observed real sky spectrum than the 'super sky', showing smaller residuals and variance, with an average closer to zero. This method serves as a viable solution, particularly when dealing with colour variations observed during bright moonlit nights. [ABSTRACT FROM AUTHOR]

In the recent years, great progress has been made in developing terrestrial and satellite-based networks for the measurement of atmospheric parameters, which serve as inputs in clear sky parametric models. However, some parameters may still be missing from the model input due to small temporal sampling or lack of in situ data. This paper presents a case study on the accuracy of the clear-sky solar irradiance estimation by a parametric model, when the availability of inputs is limited. The study was conducted with high-quality radiometric and atmospheric data recorded by the INOE-Magurele station, Romania. Seven different scenarios were studied. In each scenario the clear-sky solar irradiance model was run assuming that certain parameters are missing from the input. The results quantitatively confirm the dominant role of aerosols in establishing the accuracy of solar irradiance estimation under clear sky conditions. The unavailability of the measured Ångström turbidity coefficient may lead to a twofold/threefold increase in the uncertainty of direct-normal/diffuse solar irradiance estimation. [ABSTRACT FROM AUTHOR]

Copyright of RumeliDE Journal of Language & Literature Research / RumeliDE Dil ve Edebiyat Araştırmaları Dergisi is the property of RumeliDE Uluslararasi Hakemli Dil & Edebiyat Arastirmalari Dergisi and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Erciyes Akademi is the property of Erciyes Universitesi Sosyal Bilimler Dergisi and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The continuum from Earth and Sky reminds humanity of his fortuitous origin; this means, everything remains in suspense. Against this telluric horror, mankind opposes a static world: beset by security and welfare, stranded in the mechanical order (labour servility), ignores the movement of the universe. This is a world conceived by and for weighty beings, closed like de paved ground with which they cover the earth of what it is not.

The impact of urban development is a change in the face of the city, with various building functions and heights building so that create its skyline Alone. City Manado showing exists growth city in a manner physique and non-physical so that the City of Manado has unknowingly changed the face of the city, especially in the regions Coast. Changes in the face of the city of Manado in the coastal area include changes to the skyline which was originally flat become more expressive when compared to other areas in the city of Manado. The city skyline can be an overview of what is most valued in a city, other than that the beauty of the skyline can only be enjoyed from long distance. Skyline beauty depends on observer perception and the physical form of the city. Research objectives namely to analyze the aesthetic quality of the skyline in the waterfront area of the city of Manado and analyze what factors are there Which shape it. Study This use method qualitative with approach descriptive analysis. The data analysis approach was carried out in a qualitative descriptive manner with the stages of segment division, analysis of the results recording, ground check and analysis of visual element variables. The results showed that: of the seven variables physique skyline aesthetic, only exists five variable which are contained on location study. [ABSTRACT FROM AUTHOR]

The concurrent observation of the Hainan COherent Scatter Phased Array Radar (HCOPAR) and the 630 nm all‐sky airglow imager was carried out on the night of 13 April 2015 in low‐latitudes of China. The plasma bubble recorded by the airglow imager and the Field‐Aligned Irregularities (FAIs) observed by the HCOPAR kept a good consistency. At the beginning, the FAIs were found to fill the entire plasma bubble, and they were drifting eastward together. During the dissipation process, the plasma bubble became wider and wider in zonal direction, while the airglow gray gradient on the eastern and western walls of the bubble had no much changes. Simultaneously, the echo Signal‐to‐Noise Ratio (SNR) of the irregularities in the bubble became lower and lower. The SNR at the depletion center decreased fastest, and the SNR of the FAIs on the western wall of the bubble fell more slowly than those in other parts. Polarization electric field in the bubble is suggested to have influence on the distribution of the FAIs. Gradient drift instability on the western wall supported the FAIs to live longer, and the FAIs on the eastern wall, namely on the front edge of the bubble, dissipated more rapidly. Key Points: The irregularities were generated inside the plasma bubble and concentrated at the locations with steep gradientsWhile the bubble became wider and wider, the echo Signal‐to‐Noise Ratio (SNR) of the irregularities inside decreased quicklyIrregularities at the depletion center vanished first, and the echo SNR on the eastern wall fell faster than that on the western wall [ABSTRACT FROM AUTHOR]

Different strategies for modeling Global Horizontal UltraViolet Erythemal irradiance ( G H U V E ) based on meteorological parameters measured in Burgos (Spain) have been developed. The experimental campaign ran from September 2020 to June 2022. The selection of relevant variables for modeling was based on Pearson's correlation coefficient. Multilinear Regression Model (M L R) and artificial neural network (A N N) techniques were employed to model G H U V E under different sky conditions (all skies, overcast, intermediate, and clear skies), classified according to the C I E standard on a 10 min basis. A N N models of G H U V E outperform those based on MLR according to the traditional statistical indices used in this study ( R 2 , M B E , and n R M S E ). Moreover, the work proposes a simple all-sky A N N model of G H U V E based on usually recorded variables at ground meteorological stations. [ABSTRACT FROM AUTHOR]

In a common version of the classic children's tale, a bucket falls on the head of Henny Penny (aka, Chicken Little). Theory-testing articles could include first, better, more precise, or more nuanced investigations of existing theory, or perhaps tests of existing theory in new or unique contexts. In 2007, the last year of Colquitt and Zapata-Phelan's (2007) analysis of 50 years of I AMJ i articles, theory testers, expanders, and qualifiers, accounted for about I 80% i of those published in the I Journal. i Articles that purported to offer I new i theory accounted for about 20%. [Extracted from the article]

Climate change is one of the most serious issues in the recent world. Climate change is known as caused by the increase of carbon dioxide and many countries are forced to take measures. The first big measure was the Paris Agreement in 2015, and many countries joined the agreement. According to the agreement, many of the countries declared major shifts, such as the shift to electric vehicles in the car industry. The biggest concern about climate change at this moment is the rise of the temperature and it causes more death by heat stroke in summer. It also causes more usage of air conditioning systems and emits more carbon dioxide. It became a serious vicious circle. For that reason, it is important to analyze the mechanism of the human thermal sensation, which can be affected by the environmental history of the person, such as the residential area, the length of stay, and so on. In addition, it is expected that the effect of these histories especially appears strongly outdoors. For that reason, the outdoor experiment targeting short-term residents was carried out in Bangkok. For the experiment, 5 measuring points were selected. As a result, a different tendency was grasped at one of the measuring points with an open sky. [ABSTRACT FROM AUTHOR]

Passive radiative coolers can preserve the surface temperature below ambient by simultaneously reflecting incoming solar radiation and emitting thermal radiation to the sky. Apart from thermo-optical properties of the materials, radiative cooling performance is affected by various environmental factors which determine the atmospheric transmittance. As such, field investigations lack convergence and completion. And energy balance consideration, which aids in interpreting the field investigative results, is a deterministic cogitation on convective and radiative heat transfer by the radiative cooler that ignores the uncertainties abundant in field study. In this work, we examine the cooling performance of radiative cooling materials under different subtropical weather conditions in Hong Kong and approach the problem based on probabilistic regression modelling as an alternative. At nighttime, the response variable of surface temperature reduction can be correlated with a single predictor variable of sky temperature difference, which is a lumped parameter of ambient temperature, relative humidity, and cloud fraction. At daytime, it should be parametrized with an additional variable regarding solar intensity. The regression analysis reveals that, the higher the thermal emissivity, the larger is the temperature reduction at nighttime, especially obvious for large sky temperature difference. And heavy solar heat load is absorbed by the coolers at daytime even they feature reasonably high solar reflectivity. In this regard, further increment in solar reflectivity poses the top priority in improving daytime radiative cooling performance. [ABSTRACT FROM AUTHOR]

Increased levels of artificial light at night (ALAN) have resulted in ground-based light pollution. The disappearance of the natural dark sky impacts various domains, including astronomy, environment, biodiversity, human health, energy efficiency, and climate. Concurrently, the recent influx of satellites into Earth’s orbit compounds the issue, by introducing orbital light pollution and further compromising nighttime visibility. This article briefly introduces the issue of light pollution and discusses the relationship between dark sky protection, the space environment, and the realm of space exploration. Recognizing the growing significance of preserving dark skies for different fields, the paper elucidates the important role of dark sky protection in ensuring space sustainability. [ABSTRACT FROM AUTHOR]

The radiance of sky brightness differs principally with wavelength passband. Atmospheric scattering of sunlight causes the radiation in the near-infrared band. The Antarctic is a singular area of the planet, marked by an unparalleled climate and geographical conditions, including the coldest temperatures and driest climate on Earth, which leads it to be the best candidate site for observing in infrared bands. At present, there are still no measurements of night-sky brightness at DOME A. We have developed the Near-Infrared Sky Brightness Monitor (NISBM) in the J ,  H , and K s bands for measurements at DOME A. The instruments were installed at DOME A in 2019 and early results of NIR sky brightness from 2019 January–April have been obtained. The variation of sky background brightness with solar elevation and scanning angle is analysed. The zenith sky flux intensity for the early night at DOME A in the J band is in the 600–1100 μJy arcsec−2 range, that in the H band is between 1100 and 2600 μJy arcsec−2, and that in the K s band is in the range ∼200–900 μJy arcsec−2. This result shows that the sky brightness in J and H bands is close to that of Ali in China and Mauna Kea in the USA. The sky brightness in the K s band is much better than that in Ali, China and Mauna Kea, USA. This shows that, from our early results, DOME A is a good site for astronomical observation in the K s band. [ABSTRACT FROM AUTHOR]

Introduction. The articles examines etymologies and semantics of Mongolic words denoting the sky. The system of astronomical terms in Mongolic languages is structurally complicated due to multiple layers of pre-Buddhist, Buddhist and other beliefs adopted by proto-Mongols. Goals. The work aims to identify etymological and semantic dominants characterizing this thematic group within the common Mongolic vocabulary. The concept of sky clusters with most basic ones, and lexemes to denote it are to be found in each and every language. Materials and methods. The study examines dictionaries of Mongolic languages, involves reliable proto-Mongolian lexical reconstructions by H. Nugteren and O. Mudrak. Furthermore, the paper analyzes various etymological works and Altaic dictionaries, as well as databases on semantic transitions and colexifications. Results. The Mongolic vocabularies contain four lexemes denoting the sky and two for air/airspace — all of them being largely associated with different beliefs and faiths across different areas and in different eras. So, the word *teŋgeri attests to some elements of the cult of heaven had been practiced by earliest Mongols and the latter had maintained contacts with Turkic groups. The second lexeme *hogtorgui is a Buddhist scholarly term semantically derived from the one denoting emptiness, i.e. a suggested semantic calque from the Sanskrit word that was borrowed to northern Mongolic languages from translated texts of the Buddhist Canon. The third name *köke is a hapax from the Muqaddimat al-Adab that may have arrived in western Middle Mongolian from Chagatai Turkic. The fourth word *asman is a later borrowing from Persian to vocabularies of Muslim Mongols, sometimes via Turkic languages. The fifth lexical unit *agaɣar may have been included from Buddhist Sanskrit, and the sixth word *kei — from Middle Chinese. The unexpected conclusion is that the original proto-Mongolian word to have denoted the sky simply cannot be reconstructed. Evidently, the ancient word had been displaced by the loanwords throughout most intensive cultural contacts.

Copyright of Journal Dawat is the property of Republic of Iraq Ministry of Higher Education & Scientific Research (MOHESR) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

We present deep 1.4 GHz source counts from ∼5 deg2 of the continuum Early Science data release of the MeerKAT International Gigahertz Tiered Extragalactic Exploration survey down to S 1.4GHz ∼15 |$\mu$| Jy. Using observations over two extragalactic fields (COSMOS and XMM-LSS), we provide a comprehensive investigation into correcting the incompleteness of the raw source counts within the survey to understand the true underlying source count population. We use a variety of simulations that account for: errors in source detection and characterization, clustering, and variations in the assumed source model used to simulate sources within the field and characterize source count incompleteness. We present these deep source count distributions and use them to investigate the contribution of extragalactic sources to the sky background temperature at 1.4 GHz using a relatively large sky area. We then use the wealth of ancillary data covering a subset of the COSMOS field to investigate the specific contributions from both active galactic nuclei (AGN) and star-forming galaxies (SFGs) to the source counts and sky background temperature. We find, similar to previous deep studies, that we are unable to reconcile the sky temperature observed by the ARCADE 2 experiment. We show that AGN provide the majority contribution to the sky temperature contribution from radio sources, but the relative contribution of SFGs rises sharply below 1 mJy, reaching an approximate 15–25 per cent contribution to the total sky background temperature (Tb ∼100 mK) at ∼15 |$\mu$| Jy. [ABSTRACT FROM AUTHOR]

We characterize the daytime sky quality in terms of brightness, cloud coverage, and main weather variables at the Carlos Ulrico Cesco station of the Felix Aguilar Astronomical Observatory (OAFA), located in El Leoncito National Park, San Juan, Argentina. We have collected more than 15 years of daily observations from the auxiliary sky brightness detectors of the Mirror Coronagraph for Argentina (MICA, in operations from 1997 to 2012), including daily observing reports. We additionally present data from two meteorological stations operated at the site from 2000 to 2020. We determine the main statistical properties and seasonal variability of daytime sky brightness, clear sky time fraction (CSTF), precipitable water vapor (WV), temperature, humidity, and wind speed, which are relevant for solar, particularly coronal observations. Our results confirm that El Leoncito is an excellent place to perform daytime astronomical observations. We measure a median sky brightness of 15.8 ppm, estimated at 526.0 ± 1.0 nm and 6 solar radii from the solar disk center; a median CSTF of 0.7; and a median WV below 6 mm . These values, and those of other relevant weather variables, are comparable to the levels found among the best astronomical observing sites in the world. Due to the extended period of time analyzed and high sampling frequency, the novel data and results presented in this report contribute to the analysis and interpretation of historical sky brightness data and are of great value for the future planning of daytime astronomical instrumentation at El Leoncito. [ABSTRACT FROM AUTHOR]

Atmospheric precipitable water vapor (PWV) is a critical quantity in fast-changing weather processes. Current retrieval techniques lack the spatial and/or temporal resolution necessary for a full PWV characterization. Here we investigate a retrieval method using an all-sky ground-based camera comprising a 14-bit 644 × 512-pixel microbolometer sensor array. The radiometrically calibrated infrared downwelling spectral radiance, Lλ , was acquired at rates of up to 3 min-1. For the studied site (23.56 ∘ S, 46.74 ∘ W; 786 m a.s.l.) and spectral interval, Lλ is sensitive to the PWV; the vertical distribution of humidity; and their temporal, spatial, or seasonal variations. By comparing measured and simulated Lλ , we show that the PWV can be retrieved from prior knowledge of the local humidity profile. This information can originate from radiosonde data or statistical analysis of past vertical humidity distributions. Comparison with sun photometer PWV retrievals, for stable atmospheric conditions, showed an agreement of the average PWV within 2.8 % and a precision of subsequent retrievals of 1.9 %. The PWV was also retrieved as a bi-dimensional array, allowing for the investigation of spatial inhomogeneities of humidity distribution. The method can be used for daytime or nighttime retrievals, under partly cloudy sky conditions. Potential applications include studies on convection initiation processes. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Ottoman Literature Studies / Divan Edebiyatı Araştırmaları Dergisi is the property of Journal of Ottoman Literature Studies and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This paper begins with a phenomenological analysis of the sky as understood by early modern beholders via its synonyms: ‘sky’, ‘welkin’, ‘element’, ‘vault’, ‘heavens’, and ‘firmament’. These words fall into roughly two categories. The first group conveys the experiences of the sky through primary perceptions of seeing, sensing or breathing. To recall the distinction between ‘apprehension’ and ‘comprehension’ in Midsummer Night’s Dream, they apprehend the sky as an immense, mysterious, and unapproachable domain resistant to human incursion, rather than comprehending it as an object of knowledge. By contrast, the second group are comprehending words dependant on concepts originating in Aristotelian and Ptolemaic cosmology. While all six words might have functioned roughly as synonyms of each-other throughout the period, the gap between the two groups becomes progressively wider until the new Galilean philosophy of c.1610. The paper goes on to explore the response to this gap in Shakespeare even though he is not normally considered to have been (in Empson’s words) a ‘space man’ like his contemporary Donne. It concludes by suggesting that in Shakespeare (primarily Hamlet) the perception of the visible sky was negatively impacted by the skepticism and anxiety leeching down from what Marjorie Hope Nicholson once called ‘the breaking of the circle’.

Farabi's cosmology is one of the dimensions of Farabi's philosophy that reflects his worldview. Farabi was the first Islamic philosopher to formulate a coherent theory of the universe, which became the model and basis for philosophical cosmology in the tradition of Islamic philosophy. Farabi's cosmology is a mixture of two Greek heritages, both philosophical and scientific, and the other is the heritage of the emerging Islamic civilization, which has been accompanied by his own innovation and initiative. By accepting the theory of issuance, Farabi rejected Aristotle's essentialist view of cosmology and, with an ontological approach, drew his own cosmology. Farabi's cosmology is a paradigm and pattern-oriented system whose origin is known and can be drawn based on the original origin of the destination, unlike the Aristotelian system that is an exploratory system in which beings are discovered in the stages of research and reflection. In Farabi's cosmology, implications such as theism, system-orientation, humanism, ontological precedence over epistemology, and causal relationship can be traced. The present article tries to describe Farabi's cosmology based on Farabi's origin, principles, innovations and initiatives, and then state the implications of Farabi cosmology. [ABSTRACT FROM AUTHOR]

Land surface temperature (LST) plays a dominant role in the surface energy budget (SEB) and hydrological cycling. Thermal infrared (TIR) remote sensing is the primary method of estimating LST globally. However, cloud cover leaves numerous data gaps in satellite LST products, which seriously restricts their applications. Efforts have been made to produce gap-free LST products from polar-orbiting satellites (e.g., Terra and Aqua); however, satellite data from limited overpasses are not suitable for characterizing the diurnal temperature cycle (DTC), which is directly related to heat waves, plant water stress, and soil moisture. Considering the high temporal variability in LST and the importance of the DTC, we refined the SEB-based cloudy-sky LST recovery method by improving its feasibility and efficiency and produced a global hourly, 5 km, all-sky land surface temperature (GHA-LST) dataset from 2011 to 2021. The GHA-LST product was generated using TIR LST products from geostationary and polar-orbiting satellite data from the Copernicus Global Land Service (CGLS) and the Moderate Resolution Imaging Spectroradiometer (MODIS). Based on ground measurements at the 201 global sites from the Surface Radiation Budget (SURFRAD), Baseline Surface Radiation Network (BSRN), Fluxnet, AmeriFlux, Heihe River basin (HRB), and Tibetan Plateau (TP) networks, the overall root-mean-square error (RMSE) of the hourly GHA-LST product was 3.31 K, with a bias of -0.57 K and R2 of 0.95. Thus, this product was more accurate than the clear-sky CGLS and MODIS MYD21C1 LST samples. The RMSE value of the daily mean LST was 1.76 K. Validation results at individual sites indicate that the GHA-LST dataset has relatively larger RMSEs for high-elevation regions, which can be attributed to high surface heterogeneity and input data uncertainty. Temporal and spatial analyses suggested that GHA-LST has satisfactory spatiotemporal continuity and reasonable variation and matches the reference data well at hourly and daily scales. Furthermore, the regional comparison of GHA-LST with other gap-free hourly datasets (ERA5 and Global Land Data Assimilation System, GLDAS) demonstrated that GHA-LST can provide more spatial texture information. The monthly anomaly analysis suggests that GHA-LST couples well with global surface air temperature datasets and other LST datasets at daily mean and minimum temperature scales, whereas the maximum temperature and diurnal temperature range of LST and air temperature (AT) have different anomalous magnitudes. The GHA-LST dataset is the first global gap-free LST dataset at an hourly, 5 km scale with high accuracy, and it can be used to estimate global evapotranspiration, monitor extreme weather, and advance meteorological forecasting models. GHA-LST is freely available at 10.5281/zenodo.7487284 (Jia et al., 2022b) and http://glass.umd.edu/allsky%5fLST/GHA-LST (last access: 10 February 2023; Jia et al., 2022c). [ABSTRACT FROM AUTHOR]

This paper begins with a phenomenological analysis of the sky as understood by early modern beholders via its synonyms: 'sky", 'welkin', 'element', 'vault', 'heavens', and 'firmament'. These words fall into roughly two categories. The first group conveys the experiences of the sky through primary perceptions of seeing, sensing or breathing. To recall the distinction between 'apprehension' and 'comprehension' in Midsummer Night's Dream, they apprehend the sky as an immense, mysterious, and unapproachable domain resistant to human incursion, rather than comprehending it as an object of knowledge. By contrast, the second group are comprehending words dependant on concepts originating in Aristotelian and Ptolemaic cosmology. While all six words might have functioned roughly as synonyms of each-other throughout the period, the gap between the two groups becomes progressively wider until the new Galilean philosophy of c.1610. The paper goes on to explore the response to this gap in Shakespeare even though he is not normally considered to have been (in Empson's words) a 'space man' like his contemporary Donne. It concludes by suggesting that in Shakespeare (primarily Hamlet) the perception of the visible sky was negatively impacted by the skepticism and anxiety leeching down from what Marjorie Hope Nicholson once called 'the breaking of the circle'. [ABSTRACT FROM AUTHOR]

In 1823 German astronomer Henrich Wilhelm Olbers formulated a theoretical question regarding the darkness of the night sky. Assuming an infinite universe, permeated by infinite stars, Olbers pondered on how could the night sky be dark. Modernly this question is known as the Olbers Paradox. Multiple explanations have been offered since its formulation, and some of the explanations are no longer valid or are incomplete. Only in the light of the most recent theories and astronomical observations of the 20th century can this apparent paradox be resolved. The objective of this article is to list the most relevant observational evidence that helps to clarify Olbers' Paradox. By addressing the latest discoveries in astronomy and theoretical physics, we seek to provide a comprehensive overview of the reasons why the night sky is brighter and richer in radiation than initially supposed. [ABSTRACT FROM AUTHOR]

Background: Immediate assent to high altitude affects the cognitive performance and mood of an individual, which is followed by depression and anxiety. It also affects the sleep quality, general health, and happiness quotient of an individual. Sudarshan Kriya Yoga (SKY) is a cyclical breathing technique, which has been proven successful in managing stress, depression, anxiety, and helps in the improvement of sleep quality. Purpose: The current study was to understand the role of SKY meditation on psychological parameters, happiness quotient of low landers at high altitude (Leh). Methods: It is a two-armed pre–post study with experimental and control group both are lowlanders, and their psychological parameters are being assessed when they immediately assent to high altitude (Leh). There are two groups experimental group (SKY) was from AOL SKY–AMP and has prior SKY meditation experience. The control group does not have any yoga or meditation experience. SKY–AMP is a 4 days protocol done at high altitude by the SKY group. Both groups reach Leh through air mode transportation. Results: Oxford Happiness Questionnaire (OHQ) showed a significant result in the SKY group with P ≤.001, whereas it is nonsignificant in the control group. We also observed anthropometric and physiological changes in the participants showing significant effects on weight, BMI, waist circumference, hip circumference, and blood pressure; with no significant effect in the control group. It is one of the first studies done with both two groups, where yoga and meditation are done at high altitude and then seen the changes in the groups at physical and psychological level. Conclusion: Yogic practices can be helpful in having positive psychological change in the lowlanders at high altitude. [ABSTRACT FROM AUTHOR]

Recently light pollution has been one of the most dynamically increasing form of environmental pollution. Light, if it arrives at the wrong place, time, quantity and quality, is harmful to human health and the physical environment – not to mention that it is a mere waste of energy. The brightness of the sky above Pécs was measured by SQM-L instruments in 2011 and 2019. Maps of the different neighbourhoods with different levels of light pollution have been prepared. In addition, special VIIRS day/night band satellite images were also analysed using QGIS software. Our investigations coincided with the modernization of street lighting in the city. The impact of LED illuminators installed along main roads in Pécs was observed locally. [ABSTRACT FROM AUTHOR]

The atmospheric precipitable water vapor (PWV) is a critical quantity in fast-changing weather processes. Current retrieval techniques lack the spatial and/or temporal resolution necessary for a full PWV characterization. Here we investigate a retrieval method using an all-sky ground camera comprising a 14-bit 644 x 512-pixel microbolometer sensor array. The radiometrically calibrated infrared downwelling spectral radiance, Lλ, was acquired at rates of up to 3 min−1. For the studied site (23.56° S, 46.74° W, 786 m asl) and spectral interval, Lλ is sensitive to the PWV, the vertical distribution of humidity, and their temporal, spatial, or seasonal variations. By comparing measured and simulated Lλ, we show the PWV can be retrieved from prior knowledge about the local humidity profile. This information can originate from radiosonde data or statistical analysis of past vertical humidity distributions. Comparison with sunphotometer PWV retrievals, for stable atmospheric conditions, showed an agreement of the average PWV within 2.8 % and a precision of subsequent retrievals of 1.9 %. The PWV was also retrieved as a bidimensional array, allowing the investigation of spatial inhomogeneities of humidity distribution. The method can be used for day or nighttime retrievals, under partly cloudy sky conditions. Potential applications include studies on convection initiation processes. [ABSTRACT FROM AUTHOR]

Cloud plays a vital role in many domains such as weather forecasting, power forecasting, agriculture, and so on. The fraction/amount/percentage of cloud cover over a region is a weather parameter to be considered for forecasting applications. Under suitable weather conditions the cloud cover plays a vital role is precipitation nowcasting. The relation between the cloud cover and precipitation can be directly related under suitable weather conditions. Here, we propose to estimate fraction/amount/percentage of cloud cover based on the ground based images. Pixel saturation is used for cloud cover estimation. Singapore High-dynamic-range Whole sky IMaging SEGmentation Database (SHWIMSEG) dataset images were used for testing the system proposed. Cloud cover in the range of no cloud cover (0%) to full cloud cover (100%) was tested. Once the test was carried out on SHWIMSEG dataset, the all sky images acquired from camera module (PYRA300C) are passed through the system for cloud cover percentage estimation. An accuracy of 92.49% was achieved on the images. [ABSTRACT FROM AUTHOR]

• PAR , a key parameter for productivity models, is rarely measured at weather stations. • 21 PAR models calibrated with a 10-year series for minute frequency. • Low errors obtained with calibrated PAR models for minute, hourly and daily frequencies. • PAR values are calculated considering the prevailing sky conditions performance. Photosynthetically Active Radiation (PAR) is a fundamental parameter for developing plant productivity models. Nevertheless, instrumentation for measuring PAR and to record it is scarce at conventional meteorological stations. Several procedures have therefore been proposed for PAR estimation. In this work, 21 previously published analytical models that correlate PAR with easily available meteorological parameters are collected. Although longer time scales were considered in the original publications, a minute range was applied in this work to calibrate the PAR models. In total, more than 10 million input records were gathered from the SURFRAD station network from a 10-year long time series with data frequencies recorded every 1 min. The models were calibrated both globally, using data from all stations and locally, with data from each station. After calibration, the models were validated for minute, hourly and daily data, obtaining low fitting errors at the different stations in all cases, both when using the globally calibrated models and with the models calibrated for each location. Although the PAR results in general improved for locally calibrated models, the use of local models is not justified, since the global models presented offered very satisfactory PAR results for the different climatic conditions where the meteorological stations are located. Thus, PAR estimation model should then be selected, solely considering the meteorological variables available at the specific location. When applying the globally calibrated models to input data classified according to sky conditions (from clear to overcast), the PAR models continued to perform satisfactorily, although the error statistics of some models for overcast skies worsened. [ABSTRACT FROM AUTHOR]

In this article we present a formalism for incorporating the partial-sky maps into the Gibbs ILC algorithm to estimate the joint posterior density of the cosmic microwave background (CMB) signal and the theoretical CMB angular power spectrum given the observed CMB maps. In order to generate the partial-sky maps, we mask all the observed CMB maps provided by the WMAP and Planck satellite full-sky mission using a mask that removes 22% of the entire sky. The mask we use is based on the strength of the thermal dust emissions in the Planck 353 GHz map. While implementing the Gibbs ILC method on the partial-sky maps, we convert the partial-sky-cleaned angular power spectrum into the full-sky angular power spectrum using the mode-mode coupling matrix estimated from the smoothed mask. The main products of our analysis are a partial-sky cleaned best-fit CMB map and an estimate of the underlying full-sky theoretical CMB angular power spectrum in the multipole range 2 ≤ â„" ≤ 32 along with their error estimates. We validate the method by performing detailed Monte Carlo simulations after using realistic models of foregrounds and detector noise consistent with the WMAP and Planck frequency channels used in our analysis. We can estimate the posterior density and full-sky theoretical CMB angular power spectrum without any need to explicitly model the foreground components from partial-sky maps using our method. Another important feature of this method is that the power spectrum results along with the error estimates can be directly used for cosmological parameter estimations. [ABSTRACT FROM AUTHOR]

Abstract أعادة رؤية فى إحدى قلادات توت عنخ آمون Ar]] في صندوق على هيئة الخرطوش عُثر عليه في كنز مقبرة الملك توت عنخ آمون KV 62 بطيبة، تم العثور على أروع قلادةمحلاه بشكل القمر وزهور اللوتس متناغمة مع براعمها، وهناك دلالات توضح أن الملك كان يرتديها أثناء حياته، هذا البحث سوف يقدم رؤية جديدة لهذه القلادة ورمزيتها الدينية، وسيكشف القوة السحرية لهذه القلادة. [En] In a cartouche-shaped box found in the treasury of king Tutankhamun’s tomb KV 62 in Thebes, one of the most wonderful moon-shaped necklaces with lotus flowers matching their buds was discovered. Some signs show that the King wore this necklace throughout his lifetime. This research paper presents a revised view of this necklace and its religious symbolism and explores its magic power.

Nature is frequently operationalized as greenery or water to estimate the restorativeness of the environment. Pursuing a deeper understanding of the connection between representation of naturalness and its relationship with restoration, we conducted an experiment aimed to investigate if the sky is perceived as an element of nature. The main goal of this study was to understand how the composition of the environment guides people’s selection of sky as nature in an explicit task. Moreover, we investigated how the amount of visible sky determines this relationship. One hundred five participants participated in a novel explicit judgment task conducted online. In this task, we prepared a set of images trimmed out of 360-degree high dynamic range images. The images were classified according to two primary independent variables representing type of environment (four levels: Nature, Some Nature, Some Urban and Urban) and horizon level (three levels: Low, Medium and High). Each participant was asked to select, by clicking on the image, what they consider as “nature.” In addition, they were asked to judge images on five visual analogue scales: emotional response, aesthetic preference, feeling of familiarity, the openness of the space and naturalness. For analysis, images were segmented into 11 semantic categories (e.g., trees, sky, and water) with each pixel being assigned one semantic label. Our results show that, sky is associated with selections of nature in a specific pattern. The relationship is dependent on the particular set of conditions that are present in the environment (i.e., weather, season of the year) rather than the type of the environment (urban, nature). The availability of sky on the image affects the selection of other nature labels with selections more likely when only a small amount of sky was available. Furthermore, we found that the amount of sky had a significant positive association with the naturalness rating of the whole image, but the effect was small. Our results also indicate that subjective selections of sky predict the naturalness better than trees and water. On the other hand, objective presence of trees and water has a stronger positive association with naturalness while objective presence of sky is positively associated with naturalness. The results show that, relative to its availability sky is considered as nature.