交角章动
- 网络nutation in obliquity
交角章动-
通过推导发现，奇数阶引潮力位产生的岁差章动力矩使得黄经章动和交角章动出现了异向项（即：黄经章动出现了cos项，交角章动出现了sin项）。
Theoretical deduction shows that precession-nutation moment induced by odd order tidal generating potential causes out of phases of longitude and obliquity nutation ( namely , there are cos term in longitude nutation , but sin term in obliquity nutation ) .