لَا الشَّمْسُ يَنبَغِي لَهَا أَن تُدْرِكَ الْقَمَرَ وَلَا اللَّيْلُ سَابِقُ النَّهَارِ ۚ وَكُلٌّ فِي فَلَكٍ يَسْبَحُونَ
It is not for the sun to overtake the moon, nor does the night outstrip the day. They all float, each in an orbit. [36:40]
وَكُلٌّ فِي فَلَكٍ يَسْبَحُونَ
In this ayah Allah SWT is speaking about how the sun and the moon are in orbit. Look at the letters in red, blue and green; they are all floating around the letter in orange. The next word begins with the letter ya, which is referring to floating (Tasbeeh is from the same root). SubhanAllah! The letters are floating around one another, since the concept discussed is orbit. Only the speech of Allah can be perfect in style and content!