Calendar dating

They usually occurred every second or third year, but were sometimes omitted for much longer, and occasionally occurred in two consecutive years.

If managed correctly this system could have allowed the Roman year to stay roughly aligned to a tropical year.

This article is about a calendar used for civil and liturgical purposes.

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As a result, the calendar year gains about three days every four centuries compared to observed equinox times and the seasons.In practice, intercalations did not occur systematically according to any of these ideal systems, but were determined by the pontifices.So far as can be determined from the historical evidence, they were much less regular than these ideal schemes suggest.Macrobius describes a further refinement whereby, in one 8-year period within a 24-year cycle, there were only three intercalary years, each of 377 days (thus 11 intercalary years out of 24).This refinement averages the length of the year to 365.25 days over 24 years.For the Gregorian calendar, the figure is one day in 3,030 years.

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