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。
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。
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