Take a peek at the sky tonight and you’ll see a full moon.  A full moon is when the moon and the sun are opposite of each other from an earth perspective.

The sun crosses the celestial equator moving southward. Day and Night are of equal length. The sun rises due east and sets due west everywhere on Earth. This is the autumnal equinox in the Northern[...]

The shadows of Europa and Callisto cross the face of Jupiter simultaneously, best seen from India and central Asia.