Ramadan is beginning for the world’s Muslims. The month-long observance is a time to fast, to think and to spend time with friends and family. In the United States, people of different national origins gather at Islamic centers for religious services and to celebrate their beliefs. Muslim Americans observe Ramadan in much the same way as Muslims in other countries do. There are traditions to be followed. Families buy meat prepared according to Muslim law. The meat is served after sunset, when the daily fast ends. Fasting requires Muslims to avoid eating, drinking and sexual activity during daylight hours. Families also pray together and help the poor.