(And a sign for them is the night. We withdraw therefrom the day,) meaning, `We take it away from it, so it goes away and the night comes.' Allah says:
فَإِذَا هُم مُّظْلِمُونَ
(and behold, they are in darkness.) As it says in the Hadith:
(When the night comes from here, and the day departs from here, and the sun has set, then the fasting person should break his fast.) This is the apparent meaning of the Ayah. Allah's saying:
The text now turns to: وَالْقَمَرَ قَدَّرْنَاهُ مَنَازِلَ حَتَّىٰ عَادَ كَالْعُرْجُونِ الْقَدِيمِ (And for the moon, We have appointed measured phases, until it turned [ pale, curved and fine ] like an old branch of date-palm.- 36:39). The dried bough of a date tree that gets bent like a bow is called: عُرْجُونِ (` urjun).
The stages of the moon
The word: مَنَازِلَ (manazil) is the plural of: مَنزِل (manzil) and denotes the place one arrives at. Allah Ta` la has bound the movement of the sun and the moon both with particular points, each of which is known as a Manzil or stage. Since the moon completes its orbit in one month, therefore, it has thirty or twenty-nine stages. But, as the moon disappears at least for a day during every month, therefore, its stages are generally taken to be twenty-eight. Astronomers have given these stages particular names in congruence with the stars that are found in the frontal proximity of these stages. Even during the days of Arabs of Jahiliyyah, stages were determined by these very names. The Holy Qur'an is far above these technical names. What it means to communicate are only the distances the moon traverses during particular days.
Relevant details have appeared in the commentary on Surah Yunus. It can be seen in Ma’ ariful-Qur'an, English, Volume IV, pages: 515-520. In this verse of Surah Yunus 10:5, the stages of the sun and the moon both have been mentioned: جَعَلَ الشَّمْسَ ضِيَاءً وَالْقَمَرَ نُورًا وَقَدَّرَهُ مَنَازِلَ "[ He is the One who ] has made the sun a glow and the moon a light, and determined for it the stages - 10:5". The only difference is that the stages of the moon are identified through observation, while the stages of the sun are calculated mathematically. By saying: حَتَّىٰ عَادَ كَالْعُرْجُونِ الْقَدِيمِ - (until it turned [ pale, curved and fine ] like an old branch of date-palm.- 36:39), described there is the state of the moon towards the end of the month when it recedes from the stage of the full moon to the extent that it transforms into the shape of a dried old bough bent like a bow. It is in consonance with the Arab surrounding that it has been likened to a dried bough of the date tree that assumes the shape of a crescent.
Tazkirul Quran
Maulana Wahiduddin KhanOn ayahs 36–39
The accumulation of fertile soil on the surface of the earth; the provision of water, sun and air and the potential in the seed to germinate and grow—these and other such innumerable known and unknown factors combine to produce the food-grains, fruits and vegetables which nourish human beings. This entire system of nature is not the handiwork of man. Its existence and sustenance clearly illustrate the grace of the Creator. Thoughtfully pondering over these facts would overwhelm man with gratitude towards God. Studies show that the ‘principle of pairing’ is in operation in all the things of this world. When the system of this universe is based on the principle that all objects achieve completion by way of pairing, the present world by this logic should also have its counterpart. This crucial insight establishes the possibility of a Hereafter.
Uthmani text of the Madinah mushaf (King Fahd Complex). Translation: Saheeh International. Tafsir via Quran.com.