Iranian calendar

The Iranian calendar (also known as Persian calendar or the Jalaali Calendar) is a solar calendar currently used in Iran and Afghanistan. It is observation-based (specifically, of the vernal equinox), rather than rule-based.

Related Topics:
Solar calendar - Iran - Afghanistan - Vernal equinox

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This calendar is almost unknown in the West, although it is one of the most accurate, if not the most accurate in the world. Compared with the Gregorian calendar, which errors by one day, every 3,226 years, the Iranian calendar needs a one-day correction every 141,000 years. There are two reasons for this accuracy. The Iranian calendar uses a sophisticated intercalation system for determining the leap years. And the beginning of the year, which is a natural phenomenon (arrival of the Sun at the Vernal Equinox), is precisely determined each year by astronomical observations.

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