Prayer Calculation Methods Comparison: Fajr, Isha, Asr and Local Mosque Differences

This guide explains the calculation methods exposed by the Muslim Post prayer-time tool. It is not a universal ruling on which method every Muslim should use. The goal is narrower and more practical: help readers understand why Fajr and Isha can differ across calendars, why Asr can shift by juristic method, and why the local mosque calendar still matters.

The current tool uses four method profiles: North America, Muslim World League, Egyptian General Authority, and Umm al-Qura. These profiles mainly change the twilight angles used for Fajr and Isha. Dhuhr is tied to solar noon, Maghrib is tied to sunset, and Asr depends on the selected Standard or Hanafi shadow method.

High-latitude dates can be difficult because the sun may not reach the expected twilight angle. The tool uses an angle-based night-portion fallback when an angle cannot be computed cleanly. That fallback keeps the page usable, but it should be compared with a local masjid timetable in places with extreme summer or winter light.

Use this page as a method map before trusting a clock blindly. If your mosque, teacher, or local authority publishes a prayer calendar, use this comparison to understand the difference rather than to replace local practice.