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

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

All items (30)

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