<P> Fasting during the month of Ramadan is one of the Five Pillars of Islam . The month is spent by Muslims fasting during the daylight hours from dawn to sunset . According to Islam, the Quran was sent down to the lowest heaven during this month, thus being prepared for gradual revelation by Jibreel (Gabriel) to the Islamic prophet Muhammad . Therefore, Muhammad told his followers that the gates of Heaven would be open for the entire month and the gates of Hell (Jahannam) would be closed . The first day of the next month, Shawwal, is spent in celebration and is observed as the "Festival of Breaking Fast" or Eid al - Fitr . </P> <P> The calendar is a lunar calendar, and months begin when the first crescent of a new moon is sighted . Since the Islamic lunar calendar year is 10 to 11 days shorter than the solar year and contains no intercalation, Ramadan migrates throughout the seasons . The Islamic day starts after sunset . The estimated start and end dates for Ramadan, based on the Umm al - Qura calendar of Saudi Arabia, are: </P> <Table> <Tr> <Th> AH </Th> <Th> First day (CE / AD) </Th> <Th> Last day (CE / AD) </Th> </Tr> <Tr> <Td> 1437 </Td> <Td> 06 June 2016 </Td> <Td> 05 July 2016 </Td> </Tr> <Tr> <Td> 1438 </Td> <Td> 27 May 2017 </Td> <Td> 24 June 2017 </Td> </Tr> <Tr> <Td> 1439 </Td> <Td> 16 May 2018 </Td> <Td> 14 June 2018 </Td> </Tr> <Tr> <Td> 1440 </Td> <Td> 06 May 2019 </Td> <Td> 03 June 2019 </Td> </Tr> <Tr> <Td> 1441 </Td> <Td> 24 April 2020 </Td> <Td> 23 May 2020 </Td> </Tr> <Tr> <Td> 1442 </Td> <Td> 13 April 2021 </Td> <Td> 12 May 2021 </Td> </Tr> <Tr> <Td_colspan="3"> Ramadan dates between 2016 and 2021 </Td> </Tr> </Table> <Tr> <Th> AH </Th> <Th> First day (CE / AD) </Th> <Th> Last day (CE / AD) </Th> </Tr>

How long does it take for ramadan to make a complete cycle
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