The possibility of seeing two crescent moons in one day and the interpretation of disappearance of the crescent by Sheikh Al-Islam

The theory and observation of the crescent moon is an important and complex matter. This paper presents calculations indicating the possibility of two crescents in a single day; one is related to the previous month and the other pertains to the new month. The reason for the frequent denial of this possibility is also explained. Finally, the words of Sheikh Al-Islam Ahmad Ibn Taimiah about the crescent are explained. It became clear that what is meant by the disappearance of the crescent is the absence of a crescent at the horizon in the evening.