persian calendar

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Persian calendar

The Iranian calendar or Solar Hejri (Persian: Taqwim Hejri Shamsi, Salnamay Hejri Khurshidi) is an astronomical solar calendar and one of the longest chronological records in history and is currently used in Iran and Afghanistan as the main official calendar. Beginning each year on the vernal equinox as precisely determined by astronomical observations from Tehran (or the 52.5°E meridian, which also defines IRST), this makes it more accurate than the Gregorian Calendar in being synchronized with the solar year, but harder to work out when a particular date would occur before the New Year preceding that date.

Gregorian calendar

The Gregorian calendar is the most widely used calendar in the world today. It was first proposed by the Calabrian doctor Aloysius Lilius, and decreed by Pope Gregory XIII, after whom it was named, on 24 February 1582 by the papal bull Inter gravissimas. It is a reform of the Julian calendar and continues the year numbering system of the Julian calendar, counting years from the traditional Incarnation of Jesus.