他认为这是由太阳周年视运动的不均匀引起的。

He considered that it was caused by the non-uniformity of the apparent annual motion of the sun.

youdao

他认为这是由太阳周年视运动的不均匀引起的。

He considered that it was caused by the non-uniformity of the apparent annual motion of the sun.

youdao