How Lucknow's times are computed
For Lucknow (26.86° N, 80.92° 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 India Standard Time, daylight saving included.
The default is the method usually published in India: 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.