وَجَعَلْنَا اللَّيْلَ وَالنَّهَارَ آيَتَيْنِ فَمَحَوْنَا آيَةَ اللَّيْلِ وَجَعَلْنَا آيَةَ النَّهَارِ مُبْصِرَةً لِّتَبْتَغُوا فَضْلًا مِّن رَّبِّكُمْ وَلِتَعْلَمُوا عَدَدَ السِّنِينَ وَالْحِسَابَ وَكُلَّ شَيْءٍ فَصَّلْنَاهُ تَفْصِيلًا
We made the night and the day two signs. Then We faded out the sign of the night, and made the sign of the day lightsome, so that you may seek from your Lord’s bounty and that you may know the number of years and calculation [of time], and We have elaborated everything in detail.
Agha Ali Puya Commentary
Commentary on Quran 17:12
[Pooya/Ali Commentary 17:12] Aqa Mahdi Puya says: In haste what man desires is compared to the obscurity of night which passes away. The sign of the night is the moon which does not possess any light of its own but reflects the light of the sun. Also its appearance is not regular. The sign of the day is the sun which radiates its own light. Also its appearance is regular, because of which we regulate the calculation of time, even if it is measured by the moon's revolutions.