- Victor Mayes, Saudi Timekeeping, Sky & Telescope, 66 (1983), 284
- Comparison Calendar 1356 AH to 1411 AH (14 March 1937 to 11 July 1991) (Dhahran: King Fahd University
of Petroleum & Minerals Research Institute, c. 1991) [pdf copy].
- Calendar, Clocks, in: I.I. Nawwab, P.C. Speers & P.F. Hoye (eds.), Saudi Aramco and its World:
Arabia and the Middle East (Dhahran: Saudi Arabian Oil Company, 1995), rev. ed., pp. 167-168.
- Zaki A. al-Mostafa & Moataz N. Kordi, A New Local Observation Record for a Young Moon from Saudi Arabia,
The Observatory, 123 (2003), 49-50 [ADS link].
- Ayman S. Kordi, The Psychological Effect on Sightings of the New Moon, The Observatory, 123 (2003),
219-222 [ADS link].
- Zaki A. al-Mostafa, Lunar Calendars: The New Saudi Arabian Criterion, The Observatory, 125 (2005),
25-30 [ADS link].
- Adnan A. Gadi, A Historically Comparative Study of the Beginning of Ramadan (1380-1425H) between Announced Dates and
Astronomical Dates in Saudi Arabia, in: N. Guessoum & M.Sh. Odeh (eds.), Applications of Astronomical
Calculations to Islamic Issues: Proceedings of the First Emirates Astronomical Conference, Held at the Center for Documentation and
Research, Abu-Dhabi, United Arab Emirates, 22-23 Thul Kaedah 1427 AH, 13-14 December 2006 CE (Abu-Dhabi:
ICOP, 2007), pp. 97-110 [in Arabic] [ICOP link].
- Qibla Plus: Islamic app (qibla, prayer times, Islamic calendar)
in several languages for the iPhone and iPod which allows the conversion of Western calendar dates into various Islamic calendars,
including the Umm al-Qura calendar.
Note that this webpage on the Umm al-Qura calendar is intended for informative purposes only. Only a
few English-language websites describe the Umm al-Qura calendar in any detail and the author cannot be held responsible for any errors
resulting from faulty information on this webpage.
I am grateful to Winfried Görke, Joachim Krüger and John Stockton for pointing out errors and suggesting improvements.