One of the most joyous days in the Islamic calendar, Eid al-Fitr, also known as Eid ul-Fitr or Eid, is a celebration that marks the end of Ramadan (a holy month of fasting observed by Muslims). This year Eid al-Fitr will most likely be observed on Aug. 19, 2012 in the United States. It is celebrated on the first day of Shawwal, the 10th month of the Islamic lunar calendar. Traditionally, the observance begins with the sighting of the new moon. While many will wait to see the moon or an announcement from Mecca, the Fiqh Council of North America has determined that Eid al-Fitr 2012 will fall on Aug. 19, 2012, based on astronomical calculations.