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This article explores a possible purpose and origin of the Aubrey holes. After setting the framework for the Solar calendar, we uncover a new Solar Rectangle and elucidate the mystery of the 56 holes in the Aubrey circle. The Azimuths of sunrises and sunsets of this Solar Calendar at Stonehenge in ancient times were compared with the Azimuths obtained from the Calculator of Keisan and the SkEye Astronomy Software. Finally, we establish that a Solar calendar was the original purpose for which the Aubrey Circle of holes was constructed.

A modified Teaching-Learning in Classroom (TLC) theoretical model is presented in this paper. It describes the general learning process of undergraduates in NUS in the context of the GEQ1000 module offered by the Office of Provost. The results of the simulations are within the range of expectations, such that in general, the students’ knowledge level increases over the course of a 13 weeks module. GEQ1000 is a compulsory module taken by all NUS first year students (∼2800 per semester).