Autumn Equinox 2018: What is the Autumn Equinox? When is the first day of autumn? THE Autumn Equinox is fast approaching this week and the astrological end of summer is almost upon us – but what is the Autumn Equinox and what is the first day of autumn? Share: Facebook Twitter Google+ Stumble Digg Email ThisBlogThis!Share to XShare to Facebook Related Posts:F.D.A. Says It Will Resume Inspecting Some High-Risk FoodsNorth Korea’s Less-Known Military Threat: Biological WeaponsEngland, New York and Netherlands ‘FLOODED by end of century’ as sea levels rise rapidlyElias M. Stein, Mathematician of Fluctuations, Is Dead at 87Calculator: Opioids, Car Crashes and Falling: The Odds of Dying in the U.S.Medical BREAKTHROUGH: New chemical DISCOVERED to 'tackle HOST of infectious diseases'