وَجَعَلْنَا اللَّيْلَ وَالنَّهَارَ آيَتَيْنِ فَمَحَوْنَا آيَةَ اللَّيْلِ وَجَعَلْنَا آيَةَ النَّهَارِ مُبْصِرَةً لِتَبْتَغُواْ فَضْلاً مِّن رَّبِّكُمْ وَلِتَعْلَمُواْ عَدَدَ السِّنِينَ وَالْحِسَابَ وَكُلَّ شَيْءٍ فَصَّلْنَاهُ تَفْصِيلاً
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سورة الإسراء
(17/12) We have made the night and the day two Signs (means) for you to know the numbering of years and the reckoning. We have made the Sign of the night (what is in it) invisible. We have made the Sign of the day (what is in it) visible, so that you may seek the Virtues from your Lord. And We have explained everything in detail (with distinctness).
Surah Al-Isra