We live in a world which is dynamic. That is there are changes of all sorts everywhere. Every thing has a change of its kind. This change is known through another change. That is to say, something changes to signify some other change.
The nature has its own peculiar way of marking a change. The changes in the position of the earth relative to its axis brings about changes in its reception of light from the sun. The changes in the reception of the sunlight in one complete rotation marks the different periods of time changes per rotation ranging from early morning signifying less amount of light to the noon marking the highest point of light reception to evening and finally to night which is no light at all.
Likewise the changes in the position of the earth relative to its orbit around the sun brings about changes in the amount of heat and energy received from the sun. These energy changes mark different periods of time per revolution called as seasons. The period in which the earth is closest to the sun is marked by high temperatures and is called as the summer and the period in which the earth is farthest from the sun is marked by low temperatures and is called as the winter. The two profound time periods based on the amount of heat energy received from the sun are the summer and the winter. In between there are some changes too which can be used to further divide the periods into further categories.
Fall is such a season in which trees and plants shed their leaves and get prepared for a new beginning. The falling of leaves signifies a change which we call it the fall.
Everything on the earth is worth pondering and wondering. Nothing has been there for no purpose. Every single digit or entity has a purpose to serve. Pondering over such digits or entities is what I call the true worship. This has unlimited bounties and gains. A perfect harmony with the surroundings or environment cannot be achieved without respecting the elements and factors responsible in the formation of that surroundings or the environment. You can never respect and appreciate an entity as long as you are unaware of the true purpose of its existence.