Ramadan in 2013 will begin on July 9th in North America and last 30 days, ending on August 7th. However, in some Muslim-majority countries, Ramadan may start a day later on July 10th depending on sightings of the new crescent moon. The dates provided are based on astronomical calculations by the Fiqh Council of North America rather than actual sightings. The timing of Ramadan shifts around 11 days each year on the Gregorian calendar due to differences between the lunar Islamic calendar and the solar Gregorian calendar.