“nutation constant”的概念、定义、翻译、参考文献-科学参考

单词	nutation constant
释义	nutation constant Encyclopedia 理学天文常数系统释 nutation constant章动常数真天极绕平天极在大约18.6年内描绘出一个椭圆，称为章动椭圆，其半长轴的大小称为章动常数。它是天文常数之一。 Astronomy nutation constant章动常数
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