For the more than a billion Muslims worldwide, there is nothing more sacred than the month of Ramadan, or Ramazan. It was during this ninth month of the Islamic lunar calendar that Jibril (the Archangel Gabriel in the Judeo-Christian faith) revealed the first verses of the Quran — Islam's holy text — to the prophet Muhammad. The auspicious month's start, based on the appearance of the super-slim young crescent Moon, is determined by moon-sighting committees in various Muslim countries, most notably in Saudi Arabia. This year, Ramadan will begin on Monday, April 12th, or Tuesday, April 13th.