Tang, Quan (Author)
Qu, Anjing (Author)
Abstract The Shicha of lunar eclipse is a difference between moments of full moon and middle eclipse. The first algorithm designed for Shicha is found in Yixing's Dayan li (a calendar-making system of Dayan, 724). In some calendar-making systems in the Song and Yuan Dynasties, such algorithms are also found. Scholars, such as Zhu Zaiyuconsidered that Shicha of lunar eclipse in ancient China was a correction of the moon parallax. Since the moon parallax has nothing to do with the lunar eclipse, the Shicha algorithm has been taken as a meaningless method, and criticized by historians of astronomy. According to a constructed theoretical model of Shicha of lunar eclipse, a conclusion shows that it is necessary to calculate the Shicha of lunar eclipse, and the Shicha algorithm in ancient China is not designed for the correction caused by the moon parallax.
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