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One of them 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.
The Solar Hijri calendar has been Iran's official calendar since 1925. The earliest forms of Iranian time reckoning date back as far as the second millennium BCE.
Instead, it is the number of days between two vernal equinoxes that determines if has 29 or 30 days.
Common years in the Gregorian calendar Leap years in the Gregorian calendar A number of complex mathematical rules have been suggested to determine the distribution of leap years in the Solar Hijri calendar.
The Solar Hijri calendar is not to be confused with the Hijri calendar used in many Muslim countries and by Muslims around the world. The Solar Hijri calendar is a solar calendar, meaning that its time reckoning is based on the Earth's movements around the Sun.
Tying the Solar Hijri calendar so closely to the astronomical seasons makes it much more accurate than the Gregorian calendar, which, even in its modern form, deviates from the solar year by 1 day in 3236 years. Like in the Gregorian calendar, a common year in the Solar Hijri calendar has 365 days while a leap year has 366 days.However, because the Solar Hijri calendar is an observational calendar, there are no mathematical rules to determine leap years.The year begins at midnight closest to the vernal equinox in Iran – specifically at the Iran Standard Time meridian at longitude 52.5° east, which runs about 250 miles (400 km) east of Tehran. Because of this, the year counts between the Solar Hijri calendar and the Hijri calendar differ substantially.The first day of the new year is called Nowruz, and it is celebrated around the world by Iranian people. For example, January 1, 2016 fell into year 1394 in the Solar Hijri calendar, which corresponds to year 1437 in the Hijri calendar.This visa is issued for a maximum stay of 30 days with option of in Iran.
The visa remains valid for a period of 3 months from the date of issue.