The timing of the Hajj varies from one year to the next, Eltahir explains, because it is based on the lunar calendar rather than the
solar calendar. Each year the Hajj occurs about 11 days earlier, so there are only certain spans of years when it takes place during the hottest summer months.
While Eid al-Adha is always on the same day of the Islamic calendar, the date on the Gregorian calendar varies from year to year since the Islamic calendar is a lunar calendar and the Gregorian calendar is a
solar calendar. The lunar calendar is approximately eleven days shorter than the
solar calendar.
"The
solar calendar and the lunar calendar run separately from each other, and are different.
He also contributed to a
solar calendar completing it in 21 March 1079, variants of which are still used in Iran and Afghanistan.
His efforts gave rise to the Jalali calendar, which is a
solar calendar, based on making eight of every 33 years leap years.
Tipu abandoned the Hijri calendar and used the Maulidi system which was based on the
Solar calendar starting from the year in which the Holy Prophet was born.
Faithful celebrated 'International Milad-e-Mustafa (PBUH)' here at Eidgah on Monday night with great reverence, which falls on April 22 as per the
solar calendar year.
The Mogul monarch applied a brilliant idea to come out of this crisis, and he implemented
solar calendar again in place of the lunar one, which paved way for the Bengali New Year celebration on Pahela Baishakh.
Since then, the Iranian nation annually celebrates Farvardin 12 on the
solar calendar year, which falls on April 1 in normal years and March 31 in leap years, as the anniversary of the establishment of the Islamic Republic of Iran.
Before that, North Koreans used to celebrate on the first day of the New Year according to the
solar calendar. In the South, the New Year was celebrated twice ?
The country uses traditional Khmer calendar for the Buddhist holidays and syncs it with
solar calendar for other business holidays.
They kept the names of the lunar months but in fact they followed a
solar calendar. That meant that hajj would fall in the proper date once every 33 years.