In this modeling process, the precession, nutation and some other astronomical quantities are considered through two standards released by U. S. Naval Observatory in 1981 and 2005, respectively.
建模过程中，对岁差、章动等量的计算分别考虑了美国海军天文台1981年和2005年的两种天文标准。
In this modeling process, the precession, nutation and some other astronomical quantities are considered through two standards released by U. S. Naval Observatory in 1981 and 2005, respectively.
建模过程中，对岁差、章动等量的计算分别考虑了美国海军天文台1981年和2005年的两种天文标准。
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