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If you number the years within each cycle starting with 0, then leap years are the years that are divisible by 4, except that the year 0 is not a leap year. For example, within a 29-year cycle, the years numbered 4, 8, 12, 16, 20, 24, and 28 are leap years with 30 days in Esfand, while the rest are common years with 29 days in the month of Esfand. |
If you number the years within each cycle starting with 0, then leap years are the years that are divisible by 4, except that the year 0 is not a leap year. For example, within a 29-year cycle, the years numbered 4, 8, 12, 16, 20, 24, and 28 are leap years with 30 days in Esfand, while the rest are common years with 29 days in the month of Esfand. |
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| − | How accurate are these rules? |
+ | How accurate are these rules? as mentioned above, it takes over 100,000 years for the calendar to accumulate an error of 1 day. The approximation to the tropical year under this set of rules is 365 683/2820 days, as it gives 683 leap days in 2820 years. This means the average calendar year is 365.2421986 days long, which is a much better approximation than the 365.2425 days in the Gregorian calendar. |
==References== |
==References== |
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