This article extends the concept of regular precession of angular momentumvector to any mathematical and physical vector.
本文将力学中角动量矢量的规则进动的概念拓展到任意数学或物理矢量之上；
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At any point, if the sun elevation or sun azimuth errors or the momentumvector error exceeds tolerances, the ACS will return to an appropriate mode in order to correct the problem.