A concise review of the Iranian calendar
Abstract
We present a general description of the Iranian calendar and Nowruz, which starts at the precise instant when the Sun coincides with the vernal equinox. Although the paper aims at the basic astronomical elements of the calendar, historical aspects are not ignored. Using the ephemeris provided by the French Institut de Mecanique Celeste et de Calcul des Ephemerides (IMCCE) for the period A.D. 4000 to +2500, we discuss the various definitions of the year and show that the Iranian calendar is based upon the vernalequinox year and not on the ``tropical year'' of 365.2422 days formulated by researchers in the field of celestial mechanics. Neglecting the shortterm fluctuations, the mean length of the Iranian year at the present epoch is 365.2424 solar days, corresponding to the mean interval between two successive passages of the Sun through the vernal equinox. There is now a widely spread confusion between the "tropical" and vernalequinox years, leading to the erroneous value of 365.2422 days often given for the mean interval between two successive passages of the Sun through the vernal equinox. We also analyze the intercalation system of the Iranian calendar, which is based on a 33year cycle, and point out the astronomical foundation of this cycle created by the famous Iranian mathematician, astronomer, and poet Omar Khayyam.
 Publication:

arXiv eprints
 Pub Date:
 September 2004
 arXiv:
 arXiv:astroph/0409620
 Bibcode:
 2004astro.ph..9620H
 Keywords:

 Astrophysics
 EPrint:
 24 pages, 2 figures, 4 tables, 22 references, 16 explanatory notes. HTML versions in English and French at http://wwwusr.obspm.fr/~heydari/divers/calendar.html