Source: PBS
http://www.pbs.org/wnet/religionandethics/week610/feature.html
On November 10, 2002 PBS reported that "this week, Muslims around the world began celebrating Ramadan, the holy month of prayer and fasting. During Ramadan, adult Muslims are expected to fast and abstain from sex during daylight hours. President Bush sent Ramadan greetings to Muslims and, on Thursday evening, held a special fast-breaking meal at the White House for American Muslim leaders and ambassadors from Islamic nations. Ramadan continues through early December. Muslims use a lunar calendar, and Ramadan begins with the new moon. But for devout Muslims, it's not enough to calculate mathematically when the crescent moon rises. It has to be seen. This week, Kim Lawton watched some American Muslims as they watched for the Ramadan moon."