The Gregorian date of 11 September 2025 corresponds to the Islamic Hijri date of 18 Rabiul Awwal 1447 AH. This conversion is determined by computational models that track the lunar cycle, upon which the Islamic calendar is based.
The Islamic calendar, or Hijri calendar, is a lunar system consisting of twelve months in a year of either 354 or 355 days. Unlike the solar-based Gregorian calendar, the start of each Islamic month is traditionally contingent on the first sighting of the new crescent moon (hilal). This fundamental difference causes the Islamic year to be approximately 10 to 11 days shorter than the Gregorian year, resulting in Islamic dates shifting annually relative to the Gregorian calendar. The date 18 Rabiul Awwal 1447 AH is the calculated prediction for 11 September 2025.
It is important to note that while astronomical calculations provide a highly accurate and reliable forecast, the official start of a new Islamic month can vary by a day in some regions. This variation depends on the physical sighting of the moon by local religious authorities. Therefore, for specific religious observances, the calculated date should be considered the most probable correspondence, pending official confirmation based on local moon-sighting practices.
