The main lunisolar leap cycle in history is the Metonic cycle.
This page lists some notable alternatives.
Comparison table[]
| Lunar cycle | Intercalary months | Solar cycle | Leap days | Average days per year | Average days per month |
|---|---|---|---|---|---|
| 19 years: Metonic | 7 | 19 years | 5 | 365.263158 | 29.531915 |
| 76 years: Callippic | 28 | 4 years: Julian | 1 | 365.25 | 29.530851 |
| 304 years: Hipparchic | 75 | 365.2467105 | 29.530585 | ||
| 117 years | 43 | 351 years | 85 | 365.242165 | 29.532366 |
| 372 years | 137 | 62 years | 15 | 365.241935 | 29.530537 |
| 3720 years | 901 | 365.242204 | 29.530559 | ||
| 429 years | 158 | 33 years | 8 | 365.24 | 29.530531 |
| 896 years | 330 | 128 years | 31 | 365.242188 | 29.530500 |
| 1404 years | 517 | 351 years | 85 | 365.242165 | 29.530665 |
| 1200 years | 442 | 400 years: Gregorian | 97 | 365.2425 | 29.530454 |
| 5200 years | 1915 | 29.530607 | |||
| 2919 years | 1075 | 417 years | 101 | 365.242206 | 29.530565 |
| 3750 years | 1381 | 1875 years | 454 | 365.242133 | 29.530584 |
| synodic | mean tropical | 365.24219 | 29.530589 |
All items (6)