Islamic or Hijri calendar is a calendar consisting of 12 months in a year. Once the moon is sighted, the new month commences. The Islamic calendar is a lunar calendar whose time reckoning is tied to the Moon phases.Each month lasts for a full lunation, which is the time span from one New Moon to the next. Muslims around the world use the Islamic calendar (also known as the Lunar or Hijri calendar) to determine the dates of religious events and observances. The table below gives, for nineteen years, the Muslim month which corresponds to the first Jewish month. Theoretically, the days of the months correspond in both calendars if the displacements which are a feature of the Jewish system are ignored. It consists of 354 or 355 days. This Moon cycle encompasses all the phases of the Moon. Conversions may be made by using the Tabular Islamic calendar, or, for greatest accuracy (one day in 15,186 years), via the Jewish calendar. It is often used to determine the proper days of Islamic rituals. The … Also known as the Hijri Calendar 1441, it started after the Hijrah of the Prophet (PBUH) to Madina. The beginning of each month is contingent on the visibility of the moon at the end of the previous month. The Islamic calendar is based on 12 lunar months – a new month begins when a new moon is sighted Key Dates within the Islamic Calendar: 1st day of Ramadan – 25th April Each month starts with a new lunar cycle.