“Besselian day numbers”的概念、定义、翻译、参考文献-科学参考

单词	Besselian day numbers
释义	Besselian day numbers Encyclopedia 理学天文年历释 Besselian day numbers贝塞尔日数从贝塞尔年首（也即光行差改正后的平太阳赤经等于280°的时刻）恒星的平位置（）变换到恒星视位置（）时所用到的一组参数。
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