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  • The Roman calendar changed its form several times between the founding of Rome and the fall of the Roman Empire. This article generally discusses the early Roman or pre-Julian calendars. The calendar used after 46 BC is discussed under Julian calendar. The common calendar widely used today known as the Gregorian calendar is a refinement of the Julian calendar where the length of the year has been adjusted from 365.25 days to 365.2425 days.

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