Nineteen-Day Fast to be the one foretold by the Báb, accepted the fast, but altered many of its details and regulations. The Bahá'í fast resembles fasting practices of several other religions. Lent is a period of fasting for Christians, Yom Kippur and many other holidays for Jews, and the fast of Ramadan is practiced by Muslims. The Bahá'í fasting most resembles the fast of Ramadan, except that the period of fasting is defined as a fixed Bahá'í month, whereas Muslims fast during a lunar month, whose specific Gregorian dates vary from year to year. Bahá'u'lláh established the guidelines of the fast in
Ramadan (calendar month) moon travels the same path all year round and when the moon is seen in the east, it is then seen traveling towards the west. All the countries around the world see the moon within a 24-hour period once spotted by one country in the east. Each year, Ramadan begins about eleven days earlier than in the previous year. Astronomical projections that approximate the start of Ramadan are available. 33 Islamic years are approximately equal to 32 tropical years, with six days over. Ramadan is observed by Muslims during the entire lunar month by the same name. The month of