When does Mexico's autumnal equinox take place in 2022 and what is it?

Beginning with the autumnal equinox in 2022, we shall enter a time of year defined by ochre tones: When does it happen, and what exactly is it, in Mexico?

When does Mexico's autumnal equinox take place in 2022 and what is it?
Chichén Itza is a popular destination to observe the Autumn Equinox in Mexico. Image by Sára Pračková from Pixabay