Autumn doesn’t boldly announce its presence but rather creeps in. Since schools are back in session in August and early September, many who consider these last few weeks to be the beginning of fall start consuming pumpkin-flavored treats, even in extreme heat.

Astronomical season purists prefer to defer to the position of the sun. This Monday (September 22) marks the fall equinox, which is the official beginning of astronomical autumn.

The day before, a partial solar eclipse will be visible to those in its path in the Southern Hemisphere. (The North got its turn in March.) Let’s take a deeper look at what this all means.

What is an equinox?

The Earth revolves around the sun while simultaneously turning on its own axis at a tilt of about 23.5 degrees. These processes cause different par

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