假如你查阅以太阳为中心的星历表你就会发现在1929年2月的后段时间，出现了一个在巨蟹座的重合！
If you look up your Heliocentric Ephemeris you will find that "in the latter part of February 1929" there was a conjunction in Cancer! No wonder why the morning was "sunshiny"!
也就是在那里，在哥白尼学说出现的1800年之前，阿里斯塔克确立了以太阳为中心的太阳系的假说，埃拉托色尼计算出了地球的周长。
It was there, 18 centuries before the Copernican revolution, that Aristarchus posited a heliocentric solar system and Eratosthenes calculated the circumference of the Earth.
这些行星都以太阳为中心以椭圆轨道公转，虽然除了水星的十分接近于圆。
These planets all take sun as center by elliptical orbit revolution, although extremely approaches except Mercury to the circle.
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