如果假设行星是以那样的方式绕着太阳转，那么他所观察到的行星运动就更加具有说服力了。
If you assume that the planets are moving around the sun in that way, then he found out that the observed motion of the planets fit much better.
他还提出地球在围绕太阳转的同时，它本身还自转，这样就说明了行星运动的变化情况以及星球亮度问题。
He also suggested that the earth was spinning as it went round the sun and this explained changes in the movement of the planets and in the brightness of the stars.
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