And We made the night and the day two signs, [both] indicators of Our power. Then We effaced the sign of the night, extinguishing its light with darkness, so that you might repose therein (the annexation [āyata’layli, ‘the sign of the night’, is explicative), and made the sign of the day sight-giving, in other words, one in which it is possible to see because of the light; that you may seek, therein, bounty from your Lord, by earning [your livelihood], and that you may know, by both [day and night], the number of years and the reckoning, of the times [of the day], and everything, that might be needed, We have detailed very distinctly, We have explained clearly.