question #3 Sahih Muslim 612a, Book 5, Hadith 219 : What is the significance of the twilight in determining the time for Maghrib prayer?

“When you pray Fajr, its time is until the first part of the sun appears. When you pray Zuhr, its time is until ‘Asr comes. When you pray ‘Asr, its time is until the sun turns yellow. When you pray Maghrib, its time is until the twilight has disappeared. When you pray ‘Isha, its time is until half of the night has passed.”