How the Hijri Calendar Works: Umm al-Qura Explained
Why Hijri months last 29 or 30 days, how Umm al-Qura decides each month start, and how accurate it is compared with moon sighting.
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Articles on the Hijri Calendar
Clear, well-sourced articles with worked examples on the Hijri calendar, Umm al-Qura, moon sighting and date conversion, each linked to the hijriGO tools that apply them.
Moon Sighting or Calculation: Why Ramadan Dates Differ
Why one country starts fasting a day before another: moon sighting, calculation and differing horizons, and how to plan for it.
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Moon Sighting or Calculation: Why Ramadan Dates Differ
Why one country starts fasting a day before another: moon sighting, calculation and differing horizons, and how to plan for it.
Hijri vs Gregorian Calendar: The Differences in Numbers
Year length, why Ramadan moves through the seasons, a table of 1 Ramadan for five years, and how Hijri and Gregorian ages differ.
The Hijri Months in Order: Lengths and Sacred Months
The twelve Hijri months in order with the lengths of 1448 AH, the four sacred months, notable days in each month and the meaning of some names.
How to Convert Your Birthday to the Hijri Date
Find your birthday in the Hijri calendar, with worked examples, why it moves earlier each year, and what happens for day 30.
Add a Yearly Hijri Event to Your Phone Calendar
Why phone calendars do not repeat Hijri dates, and how to build an ICS file for a Hijri birthday or anniversary and import it.
Difference Between Two Dates, Hijri and Gregorian
Measure the time between two dates in days, months and years, why calendars differ, with a worked example and common mistakes.
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