The Fall Equinox Is Here! Wait, What's the Fall Equinox?

The Fall Equinox Is Here! Wait, What's the Fall Equinox?
It comes twice a year and marks the first day of fall, but a lot of people don’t understand this celestial alignment.
Source: National Geographic

It comes twice a year and marks the first day of fall, but a lot of people don’t understand this celestial alignment.
The Fall Equinox Is Here! Wait, What's the Fall Equinox?