The Night and the Day - the two signs of Allaah تعالى

بـسـم الله والحـمـد لله والـصلاة والـسـلام عــلى رسـول الله ، وبـعـد

The Night and the Day are among the major signs of Allaah - تعالى - of which many of us are  desensitized. Allaah تعالى has explained it in great details but many of us know not:

وَجَعَلْنَا اللَّيْلَ وَالنَّهَارَ آيَتَيْنِ ۖ فَمَحَوْنَا آيَةَ اللَّيْلِ وَجَعَلْنَا آيَةَ النَّهَارِ مُبْصِرَةً لِّتَبْتَغُوا فَضْلًا مِّن رَّبِّكُمْ وَلِتَعْلَمُوا عَدَدَ السِّنِينَ وَالْحِسَابَ ۚ وَكُلَّ شَيْءٍ فَصَّلْنَاهُ تَفْصِيلًا

{And We have appointed the night and the day as two Ayaat (signs etc.). Then, We have made dark the sign of the night while We have made the sign of day illuminating, that you may seek bounty from your Lord, and that you may know the number of the years and the reckoning. And We have explained everything (in detail) with full explanation.} [Surah al-Israa' (17):12]