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:News Analysis: An End to Heart Disease? Not QuiteMatter: A New Form of Stem-Cell Engineering Raises Ethical QuestionsOp-Ed Contributor: Why Trump’s N.I.H. Cuts Should Worry UsEven Penguins Have Children Who Won’t Leave the NestExtreme weather and pollution 'made 2016 a climate RECORD-breaker'Popular Prostate Cancer Therapy Is Short, Intense and Unproved