Autumnal Equinox
September 22 is the Autumnal Equinox for the Northern Hemisphere. During an Equinox, the Earth's equator is in direct alignment with the center of the Sun, thus illuminating the Northern and Southern Hemispheres equally. The length of day and night become equal.
Having this balance of night and day allows you to create more balance in your life.
You may also feel the need to release that which you would like to release.