The Christian calendar was originally based on the Julian calendar of the Romans.
公历最初是基于罗马的儒略历的。
It is based on 46 years BC, the "Julian calendar" as the basis.
它是以公元前46年的《儒略历法》为依据的。
By then the Julian calendar was out of sync with the seasons by 11 days.
那时儒略历对季节的偏差已到了11天。
By 1582 the Julian calendar was out of sync with the seasons by several days.
到1582年，儒略历日期对季节出现了数天的不同步。
Most European countries used the Julian calendar prior to the Gregorian.
大多数欧洲国家在格里高里历之前使用儒略历。
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 Julian calendar began in 45 BC as a reform of the Roman calendar by Julius Caesar.
儒略历在公元前45年开始被使用，它是被凯撒大帝改良的罗马历。
Our modern calendar system of 12 months started with the Julian calendar circa 45 B.C..
我们现在一年分12月的做法始于约公元前45年的儒略历。
Using the Julian calendar, the autumnal equinox, vernal equinox, and seasons were arriving 11 minutes earlier each year.
利用凯撒制定的历法，每年的春秋分日和四季都会提前11分钟。
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 solar calendar in use throughout most of the world, sponsored by Pope Gregory XIII in 1582 as a corrected version of the Julian calendar. See table at calendar.
格列高利历，公历：世界绝大部分通用的阳历，由教皇格列高利十三世于1582年倡导使用，为朱利安历法的改进版。
This approximation made the Julian calendar fairly accurate in tracking the annual seasons for several centuries. But eventually the approximation errors accumulated.
这种近似使儒略历准确工作了几百年，但是累计的误差也越来越大。
Using the Julian calendar, the spring and fall equinoxes and the seasons were arriving 11 minutes earlier each year. By 1500 the vernal equinox had fallen back to March 11.
根据罗马儒略历，春分、秋分以及四季每年提前11分钟出现，1500年后则提前至3月11日。
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 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。
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 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。
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。
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