You are reading a tafsir for the group of verses 71:15 to 71:22
3

لَمْ تَرَ‌وْا كَيْفَ خَلَقَ اللَّـهُ سَبْعَ سَمَاوَاتٍ طِبَاقًا وَجَعَلَ الْقَمَرَ‌ فِيهِنَّ نُورً‌ا

(Did you not see how Allah has created seven heavens one upon another, and has made the moon a light therein? ....71:15-16)

These verses are adduced as proof positive of Divine Oneness and His power. He has created seven heavens, one on top of the other, and placed the moon as a light in them. The prepositional phrase in the verse apparently indicates that the moon is placed in the body of the heavens. The subject is fully discussed in Surah Al-Furqan under the following verse:

تَبَارَ‌كَ الَّذِي جَعَلَ فِي السَّمَاءِ بُرُ‌وجًا وَجَعَلَ فِيهَا سِرَ‌اجًا وَقَمَرً‌ا مُّنِيرً‌ا

Glorious is the One who made stellar formations in the sky and placed therein a lamp (sun) and a bright moon. [ 25:61] Complaining about his people, Prophet Nuh (علیہ السلام) said:

وَمَكَرُ‌وا مَكْرً‌ا كُبَّارً‌ا (and they devised an enormous plan....71:22). In other words, they hatched a mighty plot. They rejected the message and persecuted Prophet Nuh (علیہ السلام) . In addition, they let loose hooligans and hoodlums on him. They agreed that they will not abandon their gods, especially the five major idols whose names appear in the following verse: