Madler proposal for leap year rule
Most accurate short leap cycle: Madler Leap rule: Absolute tropical year length: 365.2421896698 days Gregorian 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.