Calculation Method
Egyptian General Authority of Survey University of Islamic Sciences, Karachi (Shaf’i) University of Islamic Sciences, Karachi (Hanafi) Islamic Society of North America Muslim World League (MWL) Umm Al-Qurra University Fixed Isha Angle Interval (always 90) Egyptian General Authority of Survey (Egypt)
Asr Method:
Shafi'i
Hanafi

Fajr/Isha Angle : 15/15
Used in : Canada, Parts of UK, Parts of USA