The Persian Calendar for 3000 Years

Details The Persian Calendar for 3000 Years The Persian Calendar for 3000 Years

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996em%26p...74..223b&link_type=abstract

Earth, Moon and Planets, Volume 74, Issue 3, pp.223-230

Physics

Calendars Systems Conversion

Scientific paper

Using the analytical theory of the motion of the Earth around the Sun the times of the vernal (Spring) equinox has been calculated over the period from the Hijra (AD 622) to AD 3800. These data alone allow to decide whether a particular Persian (or Jalaali) calendar year is common or leap. Presented analysis shows that an algorithm implemented in the so called Khayam program is valid for the year 1799 to 2256 (1178 to 1634 Jalaali). A concise algorithm has been worked out that reconstructs the pattern of leap years over time span of about 3000 years. FORTRAN routines for conversion between the Jalaali, Gregorian and Julian calendars and the Julian Day Number are presented.

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