How are prayer times calculated for Harrow?
Sitting at roughly 51.58°N in Greater London, Harrow has its own sunrise and sunset each day, so its prayer times are worked out from its exact position rather than a regional average.
Today the sun rises at 07:37 and Maghrib falls at 17:53, giving 10h 16m between the two. As the year turns this daylight window lengthens and shortens, which is why Fajr (currently 05:45) and Isha (currently 19:38) shift gradually from week to week.
When praying in Harrow, the Qibla is faced towards the Kaaba in Makkah, which lies on a bearing of 119° from here, roughly to the south-east — a great-circle distance of about 4,811 km.
Prayer times in Harrow are very close to those in neighbouring towns, though they differ by a minute or two with distance. Nearby you can also check Ealing (8 km), Watford (9 km) and London (17 km).