It is with the movement of the sun that a year is completed...
It is with the movement of the sun that a year is completed and a correct estimate of time established. See how the sun sheds its light over the world and with what ingenuity this is! If it shone constantly only at one spot in the sky, its rays would not reach many other directions. It has, therefore, been so planned that it rises in the East and moves on constantly spreading its light from side to side till it reaches the West so that no place remains without having taken its share of advantage.
If the sun were late for a year or a part of a year, how then would the state of people be? In fact, how could they survive? Can you imagine what great, terrible problems people would face that they would have no way of changing? Therefore, the sun has been ordained to persist in its motions without a bit of delay for the survival and betterment of the world. The moon Consider the moon for it has a good sign that the public uses to identify the months.
A year is not calculated according to the motion of the moon because its motion does not comprehend the changes of seasons or the times of the growing and ripening crops and fruits. So lunar months and years are different from solar months and years. A lunar month varies in that sometimes it comes in the winter and sometimes in the summer. Consider why the moon shines at night and the ingenuity underlying it.
In spite of the need of darkness for the rest and tranquillity of animals and cool air for plants, complete absence of light and total darkness would not have any merit. There would be no possibility for work though people may sometimes need to work at night due to the short time for some works during the day or due to the extreme heat of the day. Yet, man is able to do many things under the light of the moon. The moonlight helps people work for their livelihood whenever they are so disposed.
The wayfarers find fascination in their travels. The moon has been ordained to appear in some nights and disappear in others. The moonlight is less luminous than the sunlight, lest people (out of greed) continue working in the same way as they do during the day without getting rest even unto perishment.
In the different phases of the moon (its appearance as a crescent, its disappearance, waning and eclipses), there are particular indications that all these changes have been ordained for the benefit of the universe by the Almighty Creator, and as lessons to the people of understanding. The stars O Mufadhdhal!