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365+1/4-3/400=365.2425 starting with a non leap year 7 calenders starting with a leap year 7 calendars starting with 2001, takes 28 yrs to use all of the calendars There are an almost infinite number of calendars possible. Calendars are constructs for the purpose of counting periods of time or combinations of periods. The purpose of the counting varies so the periods chosen can be varied, Those period may be based on some astronomical phenomena or on something entirely arbitrary, or a combination of both.
The Julian calendar has 100 leap years per 400 years, which makes the average length of the calendar year 365.25 days, resulting in one day of accumulated error every 128 years. The Gregorian calendar has 97 leap years per 400 years, which makes the average length of the calendar year 365.2425 days, resulting in one day of accumulated error every 3200 years.
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