Comparison guide

Solar vs Lunar Calendars: Understanding Time Cycles

Compare the Gregorian solar calendar with lunar-based systems like the Islamic or Hindu calendars to understand how different cultures track time.

Solar Calendars follow the Earth’s orbit

The Gregorian calendar is a solar system where a year is roughly 365.25 days. It is designed to keep seasons synchronized with the calendar year through the use of leap years.

Lunar Calendars sync with Moon phases

Lunar calendars track the 29.5-day cycle of the moon. This results in shorter years (around 354 days), meaning months drift relative to the solar seasons unless intercalation (extra months) is used.


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Static Calendar & Time UtilityCalculate business days, track 4 timezones live & export ISO/Unix dates — free, no account, instant in your browser.

Indian CalendarTrack Indian festivals, holidays, and important dates for 2025–2026. Includes Hindu, Muslim, Christian, and national holidays — free & private.