n.先行;[物]進動;(分點)歲差
In the third chapter, precession cone semi-angle is discussed. 第三章主要討論進動錐角的問題。
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動。
He then accounts for the precession of the equinoxes. 然后他解釋分點歲差。