Why was the solar term autumnal equinox once a traditional festival to worship the moon?

In my impression, the autumnal equinox is already half of autumn, and the days of autumnal equinox and solar terms seem to be equally divided day and night. In the autumn harvest season, at the autumn equinox, people may start sowing. It is my guess whether the Mid-Autumn Festival will gain a bumper harvest through sacrifice. I hate when books are used!

It has been said in the book that the "autumnal equinox" and the "vernal equinox" are actually the same, and they are the earliest solar terms established by the ancients. From this day on, the position of direct sunlight continued to move from the equator to the southern hemisphere, so that the time we often say is much longer. At the autumnal equinox, the temperature in many areas began to drop. The cold air from the south meets the gradually decaying warm and humid air, and it gets colder every day with the fall of autumn rain.

Because it is related to farmers' bumper harvest, people have attached great importance to the autumn equinox since ancient times. Many of these customs are not only related to specific solar terms, but also related to the hope of bumper harvest and praying for health. "Spring and Autumn Stories, Yin and Yang in and out" is recorded as follows: "The autumnal equinox is accompanied by Yin and Yang, so it is cold and summer day and night." In fact, the "autumnal equinox" has two meanings: first, the autumnal equinox lives in autumn for 90 days and is divided equally in autumn; Second, day and night are divided into 24 hours, each with 12 hours.

Listening to the old people around me, the Mid-Autumn Festival was originally scheduled for autumn, but because the first day of the eighth lunar month is different, there may not be a full moon. It is unlucky to sacrifice without the moon. Therefore, the Mid-Autumn Festival was later transferred from the Equinox to the Mid-Autumn Festival.

After the autumnal equinox every year, the temperature drops, especially for the elderly and children, and the innate fear of cold emerges. If you add some physical discomfort, people's mood will definitely become bad. After the cool autumn, I see that nature is full of depression, and some sad emotions will turn into old age and more sadness. This is the so-called sad autumn feelings that scholars often say.