Translation of the verse 13 from Surah FaTir : Number of verses 45 - - page 436 - Part 22.
He merges the night into the day (i.e. the decrease in the hours of the night are added to the hours of the day), and He merges the day into the night (i.e. the decrease in the hours of the day are added to the hours of the night). And He has subjected the sun and the moon, each runs its course for a term appointed. Such is Allah your Lord; His is the kingdom. And those, whom you invoke or call upon instead of Him, own not even a Qitmir (the thin membrane over the datestone).
He causes the night to enter the day, and He causes the day to enter the night and has subjected the sun and the moon - each running [its course] for a specified term. That is Allah, your Lord; to Him belongs sovereignty. And those whom you invoke other than Him do not possess [as much as] the membrane of a date seed.
(35:13) He causes the night to phase into the day and the day into the night, *30 and He has subjected the sun and the moon, each running its course to an appointed term. *31 That is Allah, your Lord; to Him belongs the Kingdom; but those whom you call upon, apart from Allah, possess not so much as the skin of a date-stone. *32
*30) That is, "The light of the day starts diminishing and the darkness of the night increasing gradually so as to cover up everything completely. Likewise, towards the end of the night, in the beginning, a streak of the light appears on the horizon, and then the bright day dawns."
*31) "Subjected .." : subjected to a law.
*32) The word qitmira in the original means the thin skin that covers the stone of the date-fruit; but what is meant to be said is that the gods of the mushriks do not own anything whatever. That is why we have translated it "a blade of grass", which is an insignificant thing.