Explore how different cultures and religions track time through interactive visualizations
A lunisolar calendar using astronomical observation. Learn about Adhik Maas (extra months) and the rare Kshaya Masa (skipped months).
A lunisolar calendar with a fixed 19-year cycle (Metonic cycle). Discover how Adar II keeps the calendar synchronized with seasons.
A purely lunar calendar that drifts through all seasons. Watch Ramadan cycle through winter, spring, summer, and fall over 33 years.
The world's most widely used solar calendar. Understand leap year rules, the Julian-Gregorian split, and the complex Easter calculation.
Try searching for "lunar", "solar", or a specific calendar name
| Calendar | Type | Leap System | Accuracy | Year Length |
|---|---|---|---|---|
| Gregorian | Solar | Every 4 years (except 100, unless 400) | 1 day per 3,236 years | 365.2425 days |
| Hindu | Lunisolar | Adhik Maas (astronomical observation) | 1 day per 70,000 years | ~354 days (12-13 months) |
| Hebrew | Lunisolar | 19-year cycle (7 leap years) | 1 day per 231 years | ~354 days (12-13 months) |
| Islamic | Purely Lunar | 30-year cycle (11 leap days) | Intentional drift | 354-355 days |
Hindu
Astronomical rules determine when to add/skip months based on Sun's position
Hebrew
Fixed 19-year pattern repeats - predictable centuries in advance
Islamic
Pure lunar - intentionally drifts through all seasons every 33 years
Gregorian
Solar with complex leap rules - accurate to 1 day per 3,236 years