我们还是可能放弃光学天文学，选择无线电天文学。

We might as well give up on optical astronomy and go with radio astronomy.

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在天文学中，在光学天文学中，我们不能测量周期或者可见光的频率。

In astronomy, in optical astronomy, we cannot measure the period or the frequency of optical light.

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然而，在希腊和其他地方有一些天文学家不同意地心说的观点，例如，一位生活在公元前三世纪的希腊天文学家。

However, there were a few astronomers in Greece and other places who didn't agree with the geocentric view, for example, a Greek astronomer who lived in the third century B.C.E.

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