Calendar Systems & Timekeeping
Solar Calendar
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<holidayfyi-glossary slug="solar-calendar"></holidayfyi-glossary>A calendar system based on the Earth's revolution around the Sun, with the year divided to track the solar cycle and seasons. The Gregorian calendar and the Solar Hijri calendar (used in Iran and Afghanistan) are solar calendars. Solstices and equinoxes are key reference points in solar calendar systems.