The mohammedans probably define sunrise and sunset by the actual visibility of the sun at a particular location.
Ramadan fasting is defined by sunrise and sunset at the local horizon.
That must be the reason.
The village is surrounded by mountains, that must block the sun in the early morning, and again in the afternoon.
The rest of their day must be twilight. -Tom
I read years ago that the definition of morning was when they could distinguish a white thread from a black thread, and evening was when they could not distinguish the difference.
But then that may have changed.