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epicycle n.1.【天文學】本輪。2.【數學】周轉圓。

epicyclic

Venus goes through a full set of phases , proving that it must orbit around the sun , not the center of the epicycle 金星亦有盈虧,證明它必定是環繞太陽運行,而不是均輪的中心。

The centers of the epicycles of mercury and venus must lie on the line joining the earth and the sun 水星和金星的均輪中心,和地球及太陽中心永遠連成一條直線。

And the center of the epicycle moves along a larger circle around the earth 本輪的大正圓繞著地球旋轉。