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vendredi 23 septembre 2011

Happy Equinox!

We’re now in Autumn (in the Northern Hemisphere), the time when the length of day and night are roughly the same. And from here on out, the nights will be getting longer and the days shorter. It’s often difficult to explain to people how the Earth’s tilt defines how much sunlight we get every day, and how it causes the changing seasons. Here’s the easy thing to do. Show this amazing video to anyone, and they’ll totally get it. It’s a full year’s snapshots of Earth taken by NASA’s Meteosat satellite.






The Bad Astronomer, Phil Plait, has a great explainer on the Equinox, and details what you’re seeing in this video. Check it out.

by Fraser Cain on September 23, 2011

http://www.universetoday.com/89153/happy-equinox/

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