Happy first day of fall! Astronomical autumn arrives in the Northern Hemisphere today SpaceAutumnal equinox marks start of fall, but heat could stick around USA TodayAutumnal Equinox: How will daylight change in your zip code? WLWTHoroscopes to Get You Through a Bumpy Start to the Fall Season The CutDay and night get equal billing on Tuesday. A guide to the fall equinox AP News