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Nouruz the first day on the Iranian calendar falls on the March equinox, the first day of spring. At the time of the equinox, the sun is observed to be directly over the equator, and the north and south poles of the Earth lie along the solar terminator; sunlight is evenly divided between the north and south hemispheres.
March 20th, 21st or 22nd, some communities celebrate on the actual Spring Equinox. Others celebrated on a fixed day every year.
