Allah (swt) swears by the sun and its light that overflows the earth and overrides the darkness of night. Without any doubt, it is one of Allah’s (swt) miracles in this universe. Allah (swt) mentions it in the Holy Qur’an more than thirty-two times and made it a sign of His (swt) great creation. It is a shining light giving warmth, light and heat. it is, as well, the source of earth’s life and everything on it.
Allah (swt) does not just swear by the sun but by its brightness, as well; the time when the sun rises in the sky before it becomes vertical with earth, then it moves towards sunset and disappears. So, the brightness (daylight) is a universal visible phenomenon that Allah (swt) made it the best time for movement, labour and toil, even that, Musa (pbuh) defined this time for confronting Egypt’s Pharoah, so he said:
{قَالَ مَوْعِدُكُمْ يَوْمُ الزِّينَةِ وَأَن يُحْشَرَ النَّاسُ ضُحًى }
([Moses] said, “Your appointment is on the day of the festival when the people assemble at mid-morning.”) (Taa-Haa: 59)