adv. astronomically
祖不仅在数学上很成功，而且在天文学上也很成功。
天文学上把彗星按照它们的轨道周期分类。
Asteroids classify comets based on the durations of their orbits around the sun.
二十四节气在天文学上是以视太阳在黄道上的位置来确定的。
Astronomically, the Twenty-four Solar Terms are defined according to the position of the sun on the ecliptic.
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