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| Introduction |
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| Umm al-Qura calendar (astronomical rules) |
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| Umm al-Qura calendar date converter |
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| Principal Islamic days of observance (1420 AH to 1450 AH) |
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| Adjustment of the Umm al-Qura calendar |
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| The Islamic Solar Calendars of Saudi Arabia |
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| Literature & web links |
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| 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) |
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| 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 (February 2025) |
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