古代历法确实是基于经验公式，属于近似算法吧，严格上来说由于三体问题在现有知识体系下无解，所以现代的天文算法也是经验公式，只是更高级更准确，问题是不知道calendar(1)的经验公式和你使用的算法哪个更符合清朝历法所用的计算方法
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