What is one of the world's most accurate calendar systems?
The Gregorian calendar deviates from the solar year by 1 day in 3236 years.
The Solar Hijri calendar, also known as Persian Calendar, Iranian Calendar, and SH Calendar, used in Iran and Afghanistan, is more accurate.
A year in this observational calendar has 12 months. The first 6 months have 31 days, and months 7 through 11 have 30 days. The last month, Esfand, has 29 days in a common year and 30 days in a leap year.
One of complex mathematical rules that determine the distribution of leap years in it achieves a degree of accuracy very similar to that of the observational version, requiring about 110,000 years to accumulate an error of 1 day.
Its first version, the Jalali calendar, was developed in the 11th century by astronomers including the Persian scientist Omar Khayyam.
Although the Solar Hijri calendar shares this start date with the Islamic Hijri calendar, the calendar systems are not related otherwise.
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