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Gâhshomâriye Irâni) are a succession of calendars invented or used for over two millennia in Iran (Persia).
One of the longest chronological records in human history, the Iranian calendar has been modified time and again during its history to suit administrative, climatic, and religious purposes.
As each day is named after a god, it is important to observe the celebrations on the right day.
Thus the fravasis festival, which in the old calendar was kept between sunset on 30 Spandarmad and sunrise on 1 Frawardin, was now observed throughout the epagemonai.
Although the earliest evidence of Iranian calendrical traditions is from the second millennium BCE, predating the appearance of the Iranian prophet Zoroaster, the first fully preserved calendar is that of the Achaemenids.
Throughout recorded history, Persians have been keen on the idea and importance of having a calendar.
As their year began in the spring (with the festival of nowruz) the epagemonai were placed just before nowruz.The modern Iranian calendar is now the official calendar in Iran.It begins at the midnight nearest to the instant of the vernal equinox as determined by astronomical calculations for the Iran Standard Time meridian (52.5°E or GMT 3.5h).A 13th month was added every six years to keep the calendar synchronized with the seasons. The first calendars based on Zoroastrian cosmology appeared in the later Achaemenid period (650 to 330 BCE).They evolved over the centuries, but month names changed little until now.