A concise review of the Iranian calendar

0 HEYDARI MALAYERI  –  Paris Observatory 61 Avenue de l’Observatoire 75014 Paris, France.  m.heydari@obspm.fr 1.      Introduction   The Iranian, or Persian, calendar is solar, with the particularity that the year is defined by two successive, apparent passages of the Sun through the vernal (spring) equinox. It is based on precise astronomical observations, and moreover uses a sophisticated intercalation system, which

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