Autumn Equinox 2013: TILT! Equinox and Solstices Explained infographic

Written by Gina Smith

Many college students surveyed believe seasons result from Earth’s varying distance from Sol. Nope. It’s all about TILT. Autumn Equinox 2013 Spring Equinox 2013 infographic. A great explainer of the Autumn and Spring Equinox — and the solstices, too. Seasons greetings from all of us here at — It’s September 20, 2013 and that means, astronomically, it’s officially autumn equinox 2013 here in the northern hemisphere. Or it’s the spring equinox– if you’re down on the other half of the globe, that is. Either way, we’re at a big time tilt.

I’m always amazed at annual Ivy League graduation polls that show just how many graduates think seasons come as a result of the Earth’s varying distance from the Sun. What? As all of us good science students know, the autumn equinox, the spring equinox and the summer and winter solstices are all about tilt. For the autumn equinox 2013 — Sept 20, 2013 — or vernal equinox 2013 where you live — here’s the Earth Equinox and Solstice infographic.

Find out how the Earth's tilt throughout its orbit causes Earth's seasons.
Source: OurAmazingPlanet

The equinox is here. From where I stand on the Earth, it’s autumn equinox 2013. Best season wishes wherever you are — from me and  from our staff here at …

Gina Smith is the New York Times best-selling author of Apple co-founder Steve Wozniak’s memoir, ” iWOZ: How I Invented the Personal Computer and Had Fun Doing It”. (W.W. Norton, 2005/2007/2012). With John C. Dvorak and Jerry Pournelle, she is editorial director at Email her at, check out her Google + stream here or follow her @ginasmith888.