Ohio State University
Ohio State University: A Brief Introduction to the Islamic (Hijri) Calendar
Provides background information about the Islamic Calendar, also called the Hijri. Explains the differences between the Gregorian calendar and the Islamic Calendar; lists important holidays and the months of the Islamic year. Provides...
Wolfram Research
Wolfram Science World: Islamic Calendar
A very brief description of the Islamic calendar, which "has its starting point at the date of the flight of Mohammed from Mecca to Medina." Describes the format of the Islamic year in comparison to the Gregorian calendar.
Institute for Dynamic Educational Advancement
Web Exhibit: The Islamic Calendar
This website gives very detailed information about all aspects of the Islamic calendar.