This is done in astronomy, with the help of the Julian day.
天文学上就是借助儒略日来算的。
The JewishToJD() function converts a Jewish calendar date to a Julian day count.
函数的作用是：将犹太历转为儒略日计数。
The JDToJulian() function converts a Julian day count to a Julian calendar date.
将儒略日计数转为罗马儒略历。
The JDToJewish() function converts a Julian day count to a Jewish calendar date.
函数的作用是：将儒略日计数转为犹太历。
The JDToFrench() function converts a Julian day count to a French Republican Calendar date.
函数的作用是：将儒略日计数转为法国共和历。
Note: To convert between calendar formats, you must first convert to Julian day count, then to the calendar format.
注意：在不同的日历系统中转换，必须先将其 转换为儒略日计数，然后 转换为 目标日历格式。
The Julian calendar approximated the mean tropical year as 365.25 days and proposed 366-day leap years for every one divisible by four.
儒略历将太阳年划为365.25天，闰年366天，每四年一次。
The following day Julian put the model on his table and to my astonishment he started enlarging it almost scientifically.
第二天，朱利安把模型放在桌上，我吃惊地发现他开始很科学地放大它。
The following day Julian put the model on his table and to my astonishment he started enlarging it almost scientifically.
第二天，朱利安把模型放在桌上，我吃惊地发现他开始很科学地放大它。
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