The masajid in my locality in the UK have subh sadiq over an hour later than the times calculated based on 18 degrees. In this situation does one follow the masajid or personally follow the masjid timetable? I have tried to explain to my family members also but they are adamant that the masajid cannot be wrong. How do these masajid justify these timings? Do they not have concern for jepeordising a persons fast?