# What is the high-latitude adjustment for prayer time… | UKPT

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

*Source: https://prayer-times.co.uk/answers/what-is-high-latitude-adjustment · 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.

## Sources

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

[Methodology](/methodology)

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