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Astronomy picture of the Day

Not sure if I should have posted this elsewhere, so my apologies in advance...

http://antwrp.gsfc.nasa.gov/apod/ima...schbaum_c1.jpg

Larger picture here: http://antwrp.gsfc.nasa.gov/apod/ima...hbaum_full.jpg

The Giant and the Glory
Credit & Copyright: Franz Kerschbaum (Univ. Vienna)

Quote:

Explanation: On a flight from Vienna to Brussels, astronomer Franz Kerschbaum looked out the window and photographed this beautiful atmospheric phenomenon, the glory, shining in the direction directly opposite the Sun. Before airplanes, the glory, known to some as the heiligenschein or the Specter of the Brocken, was occasionally seen from mountaintops. There, when conditions were right, one could look away from the Sun and see what appeared to be the shadow of a giant surrounded by a bright halo. Of course, the giant turns out to be the observer, and in the modern version a silhouette of a plane frequently occupies the glory's center. The cause of the glory is relatively complex. Briefly, small droplets of water reflect, refract, and diffract sunlight backwards towards the Sun. The phenomenon has a counterpart in astronomy, where looking out from planet Earth in the direction opposite the Sun yields a bright spot called the gegenschein.

Neat picture - at first glance I thought it was just a picture of a plane passing in front of the sun on a cloudy day...

whoa! that's freaking wierd! i think i kind of understand the concept of how it works, but not totally. i need to look up more info on this.

That's beautiful -- it's like an anti-shadow, a shadow that strikes nothing

Ah yes, I have been going to APOD every day for a long time now. This was a particularly cool one because I bet a lot of people have seen this and didn't know what to make of it.

Nice post!

wow! that is cool. i have never heard of that before.

Man, thats a new one on me. Very intresting.

very nice.. thanks for sharing