How Rangpur's times are computed
For Rangpur (25.75° N, 89.28° E) Hourora computes the sun's position for each date and solves for each prayer: Fajr 18°, Isha 18°. Asr uses the Hanafi shadow rule. The times are shown in Bangladesh Standard Time, daylight saving included.
The default is the method usually published in Bangladesh: University of Islamic Sciences, Karachi. You can choose another method, the Asr rule and the high-latitude rule above; the choice is saved on this device.