Zoroastrian calendar

religion

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In calendar: Iran
…century bce, at least, used Zoroastrian month and day names in documents in Pahlavi (the Iranian language of Sāsānian Persia). The origin and history of the Zoroastrian calendar year of 12 months of 30 days, plus five days (that is, 365 days), remain unknown. It became official under the Sāsānian…
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In Zoroastrianism: The Arsacid period
…of the use of a Zoroastrian calendar, implying the official recognition of Zoroastrianism, is found some 40 years earlier at Nisa (near modern Ashgabat in Turkmenistan). By then some form of orthodoxy must have been established in which Auramazda and the entities (powers surrounding him) adjoin other gods such as…
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