The Motion of Sun

" It is not permitted To the Sun to catch upThe Moon, nor can The Night outstrip the Day:Each(just)swims along In(its own) orbit (According to Law) " . (Holy Quran 36:40) .
Though the sun and the moon both traverse the belt of the Zodiac, their motions are different , they never catch up each other. When the sun and the moon are on the same side and on a line with the earth there is a solar eclipse, and when on opposite side in a line, there is a lunar eclipse, but there is no clash. Their Laws are fixed by ALLAH, and form the object of study in astronomy. Similarly Night and Day follow each other, but being opposite cannot coincide, a fit emblem of the opposition of Good and Evil, Truthand Falsehood:

Allah is He Who raised up the heavens without any support – you can see that – and then established Himself firmly on the Throne. He made the Sun and Moon subservient, each running for a specified term. He directs the whole affair. He makes the Signs clear so that hopefully you will be certain about the meeting with your Lord. (Surat ar- Ra'd, 2)
He makes night merge into day and day merge into night, and He has made the Sun and Moon subservient, each one running until a specified time. That is Allah, your Lord. The Kingdom is His. Those you call on besides Him have no power over even the smallest speck. (Surah Fatir, 13)

He created the heavens and the earth with truth. He wraps the night around the day and wraps the day around the night, and has made the Sun and Moon subservient, each one running for a specified term. Is He not indeed the Almighty, the Endlessly Forgiving? (Surah az-Zumar, 5)