周年运动
- 网络annual motion
周年运动-
地极周年运动和自由摆动的主要特征
Main characteristics of annular motion and free wobble of earth pole
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地极周年运动的多年变化与大气环流多年振动的关系
The MANY-YEARLY variation of the annual polar motion of the earth and its relation to the MANY-YEARLY fluctuation of atmospheric circulation
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事实上，我国早在汉代就发现了引起太阳周年视运动不均匀的两个原因。
In fact , two sources causing the non-uniformity were discovered as early as in Han Dynasty .