Scholars have cited numerous indications from the Quran and Sunnah that the celestial spheres are spherical, but this is not the place to discuss them. We have written what we could on this elsewhere. These include His words, exalted is He, in two places in His Book:
“And it is He who created the night and the day, and the sun and the moon, each floating in an orbit.” {33} [al-Anbiyā’ 33]
Ibn ‘Abbās said: “In a circle, like the whorl of a spindle.” In Arabic, falak denotes something round. Hence the verb tafallaka is used when a girl’s breast becomes rounded, and the spindle whorl is called a falaka.
The Prophet, may Allah bless him and grant him peace, said in an authentic hadith:
“When you ask Allah for Paradise, ask Him for al-Firdaws, for it is the highest and central part of Paradise, and its roof is the Throne of the Most Merciful.”
The highest part can be the central part only if