Calendar Wiki
Advertisement
Leap cycle
years per cycle leap days per cycle leap months per cycle leap weeks per cycle mean days per year Julian exception rule name / inventor
4 1 365.25 365 + ¼ Julian
19 7 365. N/A
28 4 365. 365 + ¼ (leap week) solar
33 8 365.(24) N/A Dee, Khayyám
60 365. 365 + 1/4 sexagesimal
62 15 11 365.24193548… N/A Sentinel
93 15.5 1 Butterfly
128 31 365.2421875 365 + ¼ – 1/128 von Mädler
132 32 365.(24) 365 + ¼ – 1/132
293 71 52 365.2423208… N/A
334 81 123 365.24251497… N/A
353 130 365. N/A
372 137 365. 365 + 1/4
391 144 365. N/A
400 97 71 365.2425 365 + ¼ – 1/100 + 1/400
= 365 + ¼ – 3/400
Gregorian
450 109 365.24(2) N/A Half orthodox
541 96 365.242144 N/A Hawaiian Slice
640 365. 365 + 1/4
656 159 365.2423780… 365 + ¼ – 5/656 ?
800 365. 365 + 1/4
900 365. 365 + 1/4 orthodox (revised Julian)
1689 622 365. N/A Goddess Lunar
2800 365. 365 + 1/4
3200 365. 365 + 1/4
6300 365. 365 + 1/4
6840 2519 365. 365 + 1/4 Meyer-Palmen Solilunar Calendar

Parentheses show repeating digits, three dots (…) show continuing decimal fractions.

All items (35)

Advertisement