 1 it was called a falak because it is round. likewise the word falak in arabic means something that is round. the falak is a round piece of the earth. dhu alrummah said
١ وسمى فلكا لاستدارته. وكذلك الفلك فى العربية هو ما استدار. والفلك قطعة من الأرض مستديرة. قال ذوالرمة