n.先行；[物]進(jìn)動(dòng)；（分點(diǎn)）歲差

In the third chapter, precession cone semi-angle is discussed. 第三章主要討論進(jìn)動(dòng)錐角的問(wèn)題。

Spacecraft tracking could look for a similar precession of Mars's orbit. 利用追蹤太空船，也可以找尋火星軌道類似的進(jìn)動(dòng)。

He then accounts for the precession of the equinoxes. 然后他解釋分點(diǎn)歲差。