《历象考成》中的太阳运动论

On the Solar Motion in the Lixiang-kaocheng

西方的地心体系(包括第谷的体系)基本上对太阳用了"简单偏心圆模型".关于西方天文学的早期中国官方著作中,《新法算书》对太阳用了"简单偏心圆模型",但是《历象考成》对太阳用了与"‘对点’模型"一样结果的"双‘本轮’模型".

In the Almagest of Ptolemy （2nd century AD）,the ＂Equant model＂ was used for planets, but the ＂Simple eccentric model＂ （without ＂equant＇） was used for the sun. Even Copernicus （1473--1543） did not use the model equivalent to the ＂Equant model＂ for the orbit of the earth. The first person who clearly abolished the simple eccentric model for the orbit of the earth was Kepler （1571--1630）. So,we can consider that the geo-centric system in the West （including Tyehonic model） basically used the simple eccentric model for the sun. In the early official works on Western astronomy composed in China,the Xinfasuanshu （新法算书） used the simple eccentric model for the sun, but the Lixiang-kaocheng （历象考成） used the double epicycle model which is almost equivalent to the ＂Equant model＂ for the sun. This is a quite interesting ease where the model equivalent to the ＂Equant model＂ for the sun was used in the geocentric system.