Here is a great explanation of the Autumn Equinox and seasons:
Long before the age of clocks, satellites and modern technology, our ancient ancestors knew a lot about the movement of the sun across the sky — enough to build massive monuments and temples that, among other purposes, served as giant calendars to mark the seasons.
What are some festivals, myths and rituals still with us?
All around the world, the fall equinox has weaved its way into our cultures and celebrations.
In Greek mythology, the fall equinox marks the return of the goddess Persephone to the underworld for three months, where she is reunited with her husband, Hades.
Chinese and Vietnamese people still celebrate the Harvest Moon (also known as the Mid-Autumn Festival). Lanterns line the streets as people give thanks, watch the moon and eat. Round pastries called mooncakes are a Mid-Autumn Festival favorite. It’s held on the 15th day of the eighth lunar month on the Chinese calendar. That’s Monday, September 24, in 2018.