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How we calculate prayer times

• Astronomy: the open-source Adhan library, which uses high-precision solar equations from Jean Meeus's Astronomical Algorithms.
• Methods: ISNA by default in the US and Canada; Moonsighting Committee by default in the UK. See all methods.
• High latitudes: above 48° latitude, Fajr stays within the last seventh of the night and Isha within the first seventh. Authorities use different rules here, so June timetables can vary by an hour.
• Method margins: the Moonsighting Committee method adds 5 minutes to Dhuhr and 3 to Maghrib, as that method specifies.
• Hijri dates: the Umm al-Qura calendar. Moon sighting can differ by a day.
• Time zones and clock changes: the IANA time zone database, built into your browser.
• Mosques: © OpenStreetMap contributors, under the Open Database License. Listings may be incomplete or out of date.

How we check accuracy

Before release we compared our times with the independent AlAdhan API for 10 cities on 5 dates under the same method. Sunrise agreed within a minute. Asr usually agreed within 2 to 4 minutes, and Fajr and Isha agreed closely except in June at high latitudes, where the two services apply different rules. The check is repeatable and lives in the site's code.

Limits

Calculated times assume a flat horizon at the city center. They cannot replace your mosque's timetable or a scholar's judgment. If you spot an error, please tell us.