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Astronomy Picture of the Day -- A Triangular Shadow of a Large Volcano
NASA ^ | July 05, 2011 | (see photo credit)

Posted on 07/05/2011 2:12:24 AM PDT by SunkenCiv

Explanation: Why does the shadow of this volcano look like a triangle? The Mount Teide volcano itself does not have the strictly pyramidal shape that its geometric shadow might suggest. The triangle shadow phenomena is not unique to the Mt. Teide, though, and is commonly seen from the tops of other large mountains and volcanoes. A key reason for the strange dark shape is that the observer is looking down the long corridor of a sunset (or sunrise) shadow that extends to the horizon. Even if the huge volcano was a perfect cube and the resulting shadow was a long rectangular box, that box would appear to taper off at its top as its shadow extended far into the distance, just as parallel train tracks do. The above spectacular image shows Pico Viejo crater in the foreground, located on Tenerife in the Canary Islands of Spain. The nearly full moon is seen nearby shortly after its total lunar eclipse last month.

July 05, 2011

(Excerpt) Read more at 129.164.179.22 ...


TOPICS: Astronomy; Astronomy Picture of the Day; Science
KEYWORDS: apod; astronomy; lunareclipse; science
[ Image Credit & >Copyright: Juan Carlos Casado (TWAN]

1 posted on 07/05/2011 2:12:28 AM PDT by SunkenCiv
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To: brytlea; cripplecreek; decimon; bigheadfred; KoRn; Grammy; married21; steelyourfaith; Mmogamer; ...

2 posted on 07/05/2011 2:13:19 AM PDT by SunkenCiv (Yes, as a matter of fact, it is that time again -- https://secure.freerepublic.com/donate/)
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To: SunkenCiv

It’s because it’s an ICBM, not a jet liner.


3 posted on 07/05/2011 3:37:10 AM PDT by conservativeimage.com ("Uh, let me be clear. Uh." - President Barack Obama)
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To: SunkenCiv

That’s an interesting phenomenon I’ve never considered before. It makes perfect sense once you think about it. Spectacular photo too! You’re a gem, Civ.


4 posted on 07/05/2011 4:19:58 AM PDT by TheOldLady (FReepmail me to get ON or OFF the ZOT LIGHTNING ping list.)
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To: conservativeimage.com
Au Contraire! It's Bloefield's hideout. Dontcha NO!

And she took the picture!


5 posted on 07/05/2011 6:00:45 AM PDT by Young Werther ("Quae cum ita sunt" Since these things are so!)
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To: Young Werther

You appear to be obsessed with scantily clad hot chicks. It’s a wonder you can post at all.


6 posted on 07/05/2011 8:55:43 PM PDT by bigheadfred (Beat me, Bite me, Make Me write Bad Checks)
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To: SunkenCiv
"A key reason for the strange dark shape is that the observer is looking down the long corridor of a shadow —and—oh my God—it's full of stars!"
7 posted on 07/05/2011 9:01:20 PM PDT by bigheadfred (Beat me, Bite me, Make Me write Bad Checks)
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To: bigheadfred
I was a Lifeguard at Seaside Heights in Joisey. I enjoyed my era of Snookies and became hopelessly enthralled with Pretty Women.

I'm an old FART now but I saw Dr No at the Seaside Heights Drive In. My date attacked me csuse she did'nt want my attendtion to wander to Ursala!

It was a hot night and and so was my date! Nuf said.

8 posted on 07/06/2011 6:10:33 AM PDT by Young Werther ("Quae cum ita sunt" Since these things are so!)
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To: Young Werther

I don’t mind the hot chicks. Just sayin’...


9 posted on 07/06/2011 11:48:44 AM PDT by bigheadfred (Beat me, Bite me, Make Me write Bad Checks)
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