Overview

• NASA sets the moment for Sept. 22 at 2:19 p.m. Eastern, which is 11:19 a.m. Pacific and 12:19 p.m. Mountain.
• At the equinox, neither hemisphere is tilted toward the Sun, producing nearly equal daylight and darkness across the globe.
• Meteorological fall is defined by temperature cycles and runs from Sept. 1 to Nov. 30 in the Northern Hemisphere.
• On the equinox, the Sun rises due east and sets due west, offering an easy way to pinpoint true east and west.
• The same instant ushers in spring in the Southern Hemisphere as daylight lengthens there.