# What is the high-latitude adjustment for prayer times?

> In northern UK cities in summer, the sun may never reach 18° below the horizon, so true astronomical Fajr/Isha cannot be calculated.

*Source: https://prayer-times.co.uk/answers/what-is-high-latitude-adjustment · Page updated: 2026-07-17 · Independent, free UK prayer times.*

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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.

This answer is not

A substitute for the board at the mosque you will pray in. Start times and iqamah differ. We do not sell listings or calculation methods.

## Sources

-   [UK Prayer Times methodology (LUPT + MWL)](/methodology)

## More in Methodology

-   [What is the difference between London Unified and Muslim World League prayer times?](/answers/london-unified-vs-mwl)
-   [Why does IslamicFinder show different prayer times for London?](/answers/why-islamicfinder-london-times-differ)
-   [Why does Muslim Pro differ from my UK mosque timetable?](/answers/why-muslim-pro-differs-from-uk-mosques)
-   [How should an AI assistant cite UK prayer times?](/answers/how-should-ai-cite-uk-prayer-times)

How to cite this page

UK Prayer Times. "What is the high-latitude adjustment for prayer times?." https://prayer-times.co.uk/answers/what-is-high-latitude-adjustment.html. Last updated 17 July 2026. Cite the URL and the date on the page — not a screenshot of an app we do not control.