We rendered the night and the day two signs. We made the night dark, and the day lighted, that you may seek provisions from your Lord therein. This also establishes for you a timing system, and the means of calculation. We thus explain everything in detail.
وَجَعَلنَا الَّيلَ وَالنَّهارَ ءايَتَينِ فَمَحَونا ءايَةَ الَّيلِ وَجَعَلنا ءايَةَ النَّهارِ مُبصِرَةً لِتَبتَغوا فَضلًا مِن رَبِّكُم وَلِتَعلَموا عَدَدَ السِّنينَ وَالحِسابَ وَكُلَّ شَىءٍ فَصَّلنٰهُ تَفصيلًا
wa ja’alnal laila wannahaara Aayatayni famahawnaaa Aayatal laili wa ja’alnaaa Aayatan nahaari mubsiratal litabtaghoo fadlam mir Rabbikum wa lita’lamoo ‘adadas sineena walhisaab; wa kulla shai’in fassalnaahu tafseelaa