May a person rely on television, public announcements, or similar means in some Muslim... - Jurisprudential Answers - Book of Fasting

Ahmed al-Hasan Response:

Television, announcers, and similar means are like a timetable. Some of their times must first be checked to determine their accuracy and conformity with the religiously prescribed time. As stated previously: a timetable may be used if it agrees with the religious times, but it must first be examined and checked for how closely it matches those times before relying on it.