"Julian Day (Julian Day)" and "Julian calendar (Julian Calendar/Julian Date)" different. Julian calendar is Julius Caesar in 45 BC invented. 12 months a year, big 31, Xiaoyue 30, an average year in February there were 28, on a leap year in February there were 29, which means an average of 365.25 days.

儒略日(JD)的计算.txt

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