Most accurate short leap cycle: Madler Leap rule:
Absolute tropical year length: 365.2421896698 daysGregorian calendar(Current) : 365.2425 days
Madler ; 365.2421875
Madler calendar gives reduction of error 3 times. Cycle: gregorian 400 years: madler only 128 years.
Madrule: Every 4th year is leap Every 128the year is not leap.
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