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章动常数
1、constant───adj.不变的；恒定的；经常的；n.(Constant)人名；(德)康斯坦特；n.[数]常数；恒量
2、constant stream of───源源不断的
3、calorimeter constant───量热计常数
4、nutation───n.[力][天]章动；点头，垂头
5、constant pain───持续的疼痛
6、hubble constant───哈勃常数
7、constant repetition───不断重复
8、attenuation constant───[物]衰减常量；减幅常数；衰减[减幅]常数
9、hardening constant───硬化常数
1、relation between the error of nutation constant and the corrections of declinations, proper motions calculated by chain method is analysed, and the method to correct this effect is considered.───分析了章动常数误差与用连锁法计算的赤纬、自行改正之间的关系，并考虑了改正这种影响的方法。
2、stability criteria and the decay time constant of the nutation damping are obtained in an analytical form, by which the degree of the attitude stability can bd evaluated.───解析形式的稳定性判据和章动阻尼时间常数，可用以估计卫星的稳定度。