Methodology
What is the high-latitude adjustment for prayer times?
Updated 2026-07-08
Quick Answer
In northern UK cities in summer, the sun may never reach 18° below the horizon, so true astronomical Fajr/Isha cannot be calculated. A one-seventh-of-the-night estimate is used and clearly disclosed.
In detail
This affects cities such as Aberdeen, Inverness, Glasgow and Edinburgh on some summer dates. The adjustment is a recognised fiqh/astronomy compromise, not an error.
Always confirm with your local mosque — some communities prefer alternative high-latitude rules.