The Messenger of Allah (sal Allahu alaihi wa sallam) said: “Each day when the rises in the morning it announces that if anybody can do any good today they should, after today I will never return.” [Sahih Ibn Hibban]
The sun is not a stationary object in the universe. While the moon orbits around the earth, and they both orbit around the sun, our sun along with its entire solar system also moves through space. So the fact is that the sun will never return to the place from where it rises on any particular day.
Umar bin Abdul Aziz said: “The rotation of night and day is decreasing your years (alive), then why are you lazy in performing good deeds?” Once somebody advised him to put something off to the next day: He replied, “I am barely able to finish a day’s work in a day. If I put today’s work off to tomorrow then how will I be able to do two day’s work in one day?”