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The Islamic calendar is based on observations of the Moon and the length of a particular month can vary between years. For this reason, predicted dates of Eid al-Adha may be corrected at the start of the month of Dhul Hijja. This is around 10 days before the start of the festival.
This year's Eid Al Adha will likely start on Friday, September 1, 2017. Astronomy and meteorology researcher Ibrahim Al Jarwan said Eid Al Adha is astronomically expected to fall on Friday, September 1, 2017. The new moon of the 21th lunar month of Zul-Hijjah will appear on Monday, August 21, 2017 at 10:30pm. It shall disappear on Tuesday evening 35 minutes after sunset during which it will be visible on the Western skyline.
Note: Regional customs or moon sightings may cause a variation of the date for Islamic holidays, which begin at sundown the day before the date specified for the holiday. The Islamic calendar is lunar and the days begin at sunset, so there may be one-day difference depending on when the New Moon is first seen.