shifted to the spring equinox, with Nisan being the first month.

The Persian calendar begins each year at the spring equinox, observationally determined at Tehran.

The Indian national calendar starts the year on the day after the spring equinox on March 22 (March 21 during leap years) with a 30-day month (31 days in leap years), then has 5 months of 31 days followed by 6 months

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