How the prayer timings are calculated:
We are using the angle of 17.7 degrees for Fajr, and 4.5 degrees for Maghrib.

the prayer schedule has been calculated to the best of our ability. please allow a few minutes margin for fajr and maghreb prayers. if you are fasting refrain from eating or drinking at least a few minutes before fajr time for caution, and wait a few minutes after the maghreb time.

imsak means to abstain from all the mobtelaat of fast( invalidating acts), such as drinking and eating during fast period.