The sun is not required to overtake the moon, nor will the night precede the day; each of them is swimming in its own orbit.
Translation endnotes
[36:40] The expression KuLlun FiY Fa- LaK (each in an orbit) describing the motion of the sun, moon, and earth is palindromic. The letters of the expression (K, L, F, Y, F, L, K), with its cyclic nature, symbolizes the circular/ellipsoid orbits. Similar expression is found at 21:33. The Quran is an interesting book (72:1). Note that the Arabic word kul (all) refers to more than two bodies and it should include the sun, the moon, and the reference planet from the expression "night and day." It is also noteworthy that the Quran frequently uses the expression, "alternation of night and day" rather than "rotation of the Sun," pulling our attention to the rotation of the planet around itself. See 21:33; 27:88; 39:5; 68:1; 79:30.