His ideas had problems, which we'll get to in a later episode, but it did an incrementally better job than geocentrism.

他的想法其实有些问题，我们将在以后的课程中讨论，不过已经比地心说进步很多了。

Until the 16th Century, geocentrism was a prevailing theory of what the universe looked like.

直到 16 世纪，地心说一直是宇宙外观的流行理论。