Fiqh-us-Sunnah Volume 3, Zakaat and Fasting, Fiqh 3.144.
Section : Places where the day is extremely long and the night is short.
Scholars differ about what the Muslims who are in areas where the day is extremely long and the night is short should do. What timings should they follow? Some say they should follow the norms of the areas where the Islamic legislation took place – that is, Makkah or Madinah. Others say they should follow the timings of the area that is closest to them which has normal days and nights.