Why Prayer Apps Show Different Times (Calculation Methods Explained)

You check Fajr on one app and it says 4:12. Your friend's app, same city, says 4:31. Neither app is broken and neither is being careless — they're using different, equally established scholarly conventions. Here's what's actually going on.

Which prayer times are calculated, and which are observed

Three of the five prayer times come almost directly from the sun's position and are essentially agreed upon:

• Dhuhr — just after the sun passes its highest point (solar noon)
• Maghrib — at sunset
• Asr — when an object's shadow reaches a defined length (see below)

The two that vary between apps are Fajr and Isha, because both are defined by twilight — the light before sunrise and after sunset — and twilight has no single sharp moment. It fades. Where exactly you draw the line is a scholarly judgement, expressed mathematically as an angle.

Solar depression angles, explained simply

After sunset the sun keeps descending below the horizon, and the sky keeps darkening. Astronomers measure how far below the horizon it has travelled in degrees. Fajr begins at true dawn, when the first white light spreads across the horizon; Isha begins when the red afterglow disappears.

Scholarly bodies have placed those moments at different angles, and this is the entire source of the disagreement between apps:

Notice ISNA at 15° against Egypt at 19.5°. That 4.5-degree difference is why the same city can show Fajr times half an hour apart. Neither is a bug; they're different conclusions about when dawn begins, and both rest on scholarly reasoning.

Note also that Umm al-Qura and the Gulf methods don't use an angle for Isha at all — they use a fixed 90 minutes after Maghrib (120 during Ramadan for Umm al-Qura). This is why Isha in Makkah stays at a steady interval year-round.

The Asr difference: Hanafi vs the rest

Asr is defined by shadow length, and here there are two established positions:

• Shafi'i, Maliki, Hanbali (Mithl 1): Asr begins when an object's shadow equals its own length, plus the shadow it had at noon
• Hanafi (Mithl 2): Asr begins when the shadow reaches twice the object's length, plus the noon shadow

In practice the Hanafi Asr falls roughly 45 to 70 minutes later, varying by season and latitude. If your app's Asr looks "wrong" by about an hour, this setting is almost always the reason — check the madhab option before assuming the app is broken.

High latitudes: when the maths runs out

Above roughly 48° latitude — much of the UK, Scandinavia, Canada, northern Russia — the sun in summer never descends far enough below the horizon for astronomical twilight to end. There is literally no moment at which the sun is 18° down. The calculation returns nothing.

Several conventions exist for these months:

• Middle of the night: the night from sunset to sunrise is halved; Isha ends and Fajr begins at that midpoint
• One-seventh of the night: the night is divided into sevenths, with Isha at the first seventh and Fajr at the last
• Angle-based: the twilight duration is estimated from the nearest date where the angle does occur
• Nearest latitude: times are taken from the closest latitude where normal calculation works (often 45°)

These are approximations by necessity, and mosques in northern cities frequently publish their own adopted timetable. Where one exists, follow it.

What Mutaqi uses

Mutaqi calculates with the Muslim World League method (Fajr 18°, Isha 17°) and the standard Shafi'i Asr by default — a widely accepted general configuration. Calculation happens entirely on your device, so it works with no signal.

Because no single method suits everyone, Mutaqi also lets you set any prayer to a specific time of your own. If your mosque prays Isha at 8:15 regardless of the calculation, set it once in Settings → Prayer Times — the tracker, your reminders, and Prayer Focus all follow the time you set.

Small differences, one principle

It's worth keeping perspective. The variation between reputable methods is typically ten to twenty-five minutes, and every one of them rests on scholarship taking the same obligation seriously. The far more consequential question isn't which angle your app uses — it's whether you pray when the time comes.