The image below shows the difference between the Iranian calendar (using the 33-year arithmetic approximation) and the seasons. The Y axis is "days error" and the X axis is Gregorian calendar years. Each point represents a single date on a given year. The error shifts by about 1/4 day per year, and is corrected by a leap year every 4th year regularly, and one 5 year leap period to complete a 33-year cycle. One can notice a gradual shift upwards over the 500 years shown.

By comparison, the Gregorian calendar, introduced in 1582, is almost as accurate in the long term, but has larger swings of seasonal errors over centuries.

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References

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External links

• An Iranian calendar toolbar for Internet Explorer and Firefox
• Online Persian Calendar from aaahoo portal
• Online Persian Calendar Generator and Convertor
• Online Afghan Calendar with Gregorian, Hejrah-e shamsi and Hejrah-e qamari dates
• An online Jalali(shamsi)/Gregorian/Islamic(hijri) Date Convertor
• The Persian Calendar : How the leap years are calculated
• System.Globalization.PersianCalendar class documentation in MSDN Library (The implementation of Persian Calendar in Microsoft .NET Framework 2.0)
• An Interactive Iranian Calendar
• An online Persian/Gregorian date convertor, Persian calendar for mobile (j2me)
• The Zoroastrian Calendar
• Meaning of the names of the months in the Persian Calendar

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