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。
The Julian calendar began in 45 BC as a reform of the Roman calendar by Julius Caesar.
尤里乌斯·凯撒创建的儒略历准确计算出一年有365.25天，平均四年一个周期。
Instituted by Julius Caesar, the old calendar counted exactly 365.25 days a year, averaged over a four-year cycle.
我们现在一年分12月的做法始于约公元前45年的儒略历。
Our modern calendar system of 12 months started with the Julian calendar circa 45 B.C..
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