Of about 1/4, 2/3 or 3/4, Earth's orbital period is 365 & this fraction of a day
[DOC] [TLE] Solar Calendar Leap Rules - University of Toronto [PAR] The fraction indicates that a leap day cycle with 71 leap years per 293- year ..... a 
calendar mean year of exactly 365+1/4 days, like the Julian calendar, about 11 
.... of Delta T multipliers to see the effect of various Earth rotation slowdown rates.