Happy First Day of Fall!

AUTUMNAL EQUINOX 2020: THE FIRST DAY OF FALL

It is the summer’s great last heat,
It is the fall’s first chill: They meet.

–Sarah Morgan Bryan Piatt

Hello fall! Equinox kicks off autumn on Sept. 22

The fall equinox comes on Tuesday. A planetary scientist’s simple animation explains what equinoxes are and how they work.

Why is it hot in summer and cold in winter?

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