1 The sun's arrival in Librabrings the fall equinox.

2 Everywhere south of the equator, it is the fall equinox. Farmers and gardeners are harvesting and everyone is preparing for winter.

3 Explanation: Twice a year, at the Spring and Fall equinox, the Sun rises due east.

4 Twice a year, at the Spring and Fall equinox, the Sun rises due east.

5 It was only at two points in the year that the night and the day were of equal length and that was at the spring or fall equinox.

6 The full moon will appear right above Jupiter on September 22, which is coincidentally the fall equinox.

7 Day and night would each be exactly 12 hours long on a spring or fall equinox only if the sun were a single point of light and Earth had no atmosphere.