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 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。
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