Everyone is reasonably well "aware" of the reasons why the seasons are constantly changing. Indeed, since school, we know that the planet Earth revolves around the Sun and the reason for the change of seasons lies in the inclination of the earth's axis relative to its planetary orbit. Both the inclination of the axis of rotation and the distance from the Earth to the Sun do not remain constant, which means that they will little by little affect climate change and the nature of the changing seasons. This obvious fact, however, does not provide an equally obvious indication of the cause of this phenomenon.
If we talk about traditional academic science, then it builds only unconfirmed theories regarding this phenomenon, which do not give clear answers to the questions “why”. Despite this, separate scattered records have survived to this day explaining why the seasons change and when she came to this world. It came precisely because when life appeared on Earth or after people appeared on our planet in all climatic zones, the weather was the same for all three hundred and something days (it is assumed that even the duration of the year was more stable at that time).
And what led to global climate change, hit the Earth much later. Here, in fairness, it is worth noting that modern archeology was able to prove that there was not always a change of seasons on Earth. Sources that have reached our time do not indicate directly what was the cause of the cataclysm, but it is clear that it was something catastrophic and it was able to move the earth's axis. Whether it was a blow from a large celestial body, or whether Mother Earth herself began to shake, it is impossible to say at the moment. Nevertheless, today there is written evidence of the changes that have occurred (see diagrams below).
According to some sources, Chinese civilization has existed for 3 thousand years, while the Chinese themselves like the number 5000. Anyway, there are two sets of trigrams that are associated with the ancestor of the entire nation of Han - Huang Di (The Yellow Emperor). The first set of trigrams is represented by a fully balanced scheme and is translated into Russian as “Celestial.” The second set has a certain shift in its structure and is called "Post-Heavenly." In all literature, one way or another connected with the legendary “Book of Changes”, the change of seasons in its current version is associated with the “Post-Celestial” order of trigrams. Although at the same time it is said that before everything was in order, since the whole world was arranged according to the "Celestial" set of trigrams.
No less epic work “Bhagavad-gita”, which is also a kind of processing folklore about Vishnu and the entire Hindu pantheon, reports that before the opening of the underground gates and hordes of “dark forces” got out of prison and gave rise to black (it’s hard to say in what sense) of people, all people on earth lived and did not know what a change of seasons is. Of course, it is necessary to relate to such folklore records with a certain amount of skepticism. But, most likely, the sources mentioned above say the same thing. Everything flows, everything changes, and for the same reason, our idea of the nature where we live should also be revised. Otherwise, without knowledge of our past, we are unlikely to be able to look into our future.