The altitude or angle of the sun below the horizon for Isha and Fajr times varies between states/countries because there is no consensus on it.
Choose reference:
This annual prayer time calculator uses a method of calculation every 3 or 4 days and can be used every year fro same location. It is developed for users who need a compact and concise schedule. It is suitable for prayer times but less suitable for breaking the fast, for example, as it delayed two or three minutes late. Please be advised.
© 2010, 2021 ATR