Timing of fajr prayer

If what is published in the calendar conforms to what is actually observed in reality, then
the answer to your question is what was narrated by Abu Huraira in the hadith of the
Prophet
(peace be upon him): “Whoever catches a raka’a of the morning prayer
before the sun rises has caught the prayer” (i.e. on time) (Bukhari).

It must be noted, however, that praying the five daily congregational prayers in the
mosque is wajib (compulsory) for men.