The date for the start of Ramadan is slightly different each year, depending on the position of the moon. Once Ramadan starts, Muslims should not eat or drink between sunrise and sunset. This usually continues for thirty days, but sometimes twenty-nine days.
Fasting is supposed to teach Muslims about patience and spiritual things. It is a time for Muslims to think about how the poor and homeless suffer without lots of food, it helps Muslims to be more obedient, and less greedy. During Ramadan, Muslims ask to be forgiven for their sins, and they pray for help in stopping them from doing bad things. Muslims believe Ramadan is the month in which the first verses of the Qur'an were revealed to the Prophet Muhammad.