It's coming!

An equinox in astronomy is the moment when the sun passes over the equator. The event occurs twice a year, around March 21 and September 23. The word equinox derives from the Latin word for equal night. The equinoxes are the two days each year when the middle of the sun is an equal amount of time above and below the horizon for every location on earth.

If we had no winter, the spring would not be so pleasant; if we did not sometimes taste of adversity, prosperity would not be so welcome.
- Anne Bradstreet