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In 1684, during the Edo period (1603–1868), the imperial court of Japan passed a reform act that resulted in a new almanac called the Jôkyô almanac. This was the first reform in more than eight hundred years, and marked a departure from the past practice of adopting almanacs from China. Yet, the reform was complicated, and it was achieved after decades through the efforts of Shibukawa Harumi (1639–1715). How was the reform accomplished, and why was it significant? In this study, I will focus on Harumi's role in the reform. I propose to examine the reform as the culmination of a process deeply linked to Harumi's political connections and his intellectual growth especially in the field of calendrical sciences. I will show that this approach of looking at the reform by analyzing different aspects of Harumi's life has implications for understanding trends in society in seventeenth-century Japan. First, despite the ban on Christianity, intellectuals like Harumi assimilated European sciences in unique ways. Second, Harumi's activities exemplified how intellectual ties were increasingly embedded within political networks. Overall, I will argue that the reform of the almanac, viewed as a process surrounding the core figure of Harumi, was driven by scientific goals and personal ambitions. [ABSTRACT FROM PUBLISHER]

Although the Copernican hypothesis is popularized in Japan by Shiba Kōkan's books published between 1793 and 1805, the whole of the conceptions of the Occidental astronomy remains unknown at that time to most of the Japanese. Through the publication of Ensei kanshō zusetsu in 1823, Yoshio Nankō does achieve posthumously the project designed two years earlier by his young disciple, Kusano Yōjun, to spread this knowledge widely among the society. The book is a great and unprecedented success. Well known nowadays for its appendix (Chidō wakumon) and the influence that its content, while claiming the mobility of the Earth, did exert on the propagation of the heliocentrism in Japan until the very end of the Edo period, the book also provides as we think an unexpected and completely new platform for classical science, being the emissary of certain concepts invented by Shizuki Tadao from his relentless studies of Newtonian mechanics. Once we briefly recount Yoshio's career and discuss the sources and the morphology of his work, we give some arguments towards it. [ABSTRACT FROM AUTHOR]

A page from a historical Japanese almanac is presented.

A nineteenth-century Japanese depiction of a heliocentric solar system is presented.