Ramadan is the ninth month of the Islamic calendar, which follows the lunar system. As a natural phenomenon, lunar months vary in length, containing either 29 or 30 days. This means that the lunar year is 10 or 11 days shorter than the solar year, since months in the solar year often have 31 days. Ultimately, this means that those measuring against the solar calendar will perceive Ramadan as “shifting” a few days earlier each Gregorian year.
In 2025, Ramadan will begin around March 1st and end around March 30th. The exact days are confirmed by the sighting of the new moon at the start of the month.