| Introduction |
| Umm al-Qura calendar (astronomical rules) |
| Umm al-Qura calendar date converter |
| Principal Islamic days of observance (1420 AH to 1450 AH) |
| Adjustment of the Umm al-Qura calendar |
| The Islamic Solar Calendars of Saudi Arabia |
| Literature & web links |
| Note that the calendar dates for the months of Muḥarram, Ramaḍān, Shawwāl and Dhu ʾl-Ḥijja are can be adjusted by the religious authorities of Saudi Arabia after reported sightings of the lunar crescent (see Adjustment of the Umm al-Qura Calendar) |
| N.B. These web pages are best viewed on a screen of 1280 × 1024 pixels or larger |
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| Department of Mathematics |
| © R.H. van Gent (June 2025) |