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Astronomy Picture of the Day -- Saturn: Shadows of a Seasonal Sundial
NASA ^ | October 12, 2011 | (see photo credit)

Posted on 10/12/2011 6:13:52 PM PDT by SunkenCiv

Explanation: Saturn's rings form one of the larger sundials known. This sundial, however, determines only the season of Saturn, not the time of day. In 2009, during Saturn's last equinox, Saturn's thin rings threw almost no shadows onto Saturn, since the ring plane pointed directly toward the Sun. As Saturn continued in its orbit around the Sun, however, the ring shadows become increasingly wider and cast further south. These shadows are not easily visible from the Earth because from our vantage point near the Sun, the rings always block the shadows. The above image was taken in August by the robotic Cassini spacecraft currently orbiting Saturn. The rings themselves appear as a vertical bar on the image right. The Sun, far to the upper right, shines through the rings and casts captivatingly complex shadows on south Saturn, on the image left. Cassini has been exploring Saturn, its rings, and its moons since 2004, and is expected to continue until at least the maximum elongation of Saturn's shadows occurs in 2017.

October 12, 2011

(Excerpt) Read more at 129.164.179.22 ...


TOPICS: Astronomy; Astronomy Picture of the Day; Science
KEYWORDS: apod; astronomy; saturn; science
[Credit: Cassini Imaging Team, ISS, JPL, ESA, NASA]

1 posted on 10/12/2011 6:14:05 PM PDT by SunkenCiv
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To: brytlea; cripplecreek; decimon; bigheadfred; KoRn; Grammy; married21; steelyourfaith; Mmogamer; ...

2 posted on 10/12/2011 6:15:15 PM PDT by SunkenCiv (It's never a bad time to FReep this link -- https://secure.freerepublic.com/donate/)
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To: SunkenCiv

How come you post “picture of the day” mostly by night???? Really in the dark about this.


3 posted on 10/12/2011 6:36:11 PM PDT by bigheadfred (But alas)
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To: SunkenCiv

So all of Saturn’s rings are shown in that thin band on the right? Fascinating!


4 posted on 10/12/2011 6:59:53 PM PDT by workerbee (We're not scared, Maobama -- we're pissed off!)
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To: bigheadfred

That was an awful pun.


5 posted on 10/12/2011 8:08:00 PM PDT by ixtl (You live and learn. Or you don't live long.)
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To: SunkenCiv
I wish Earth had rings. Rings would look so cool!
6 posted on 10/12/2011 8:30:04 PM PDT by 6SJ7 (46 55 42 4f)
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To: workerbee

Beautiful, remarkable, inspiring and a reminder of the incredible master craftsmanship of God.....


7 posted on 10/12/2011 9:12:10 PM PDT by hatfieldmccoy (It's not racism..... it's probability, actuarial tables, statistics. Facts are stubborn things.)
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To: 6SJ7
...I wish Earth had rings....

...I thought up 10 jokes in 5 seconds for that response, but, I'll let it go this time, seeing that this is always a serious thread... (-;)

8 posted on 10/13/2011 1:18:28 AM PDT by gargoyle (...it becomes necessary for one people to dissolve the political bands which have connected them...)
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To: bigheadfred

It varies. Sometimes I get up in the early morning hours to do some business (euphemism) and rip out the APoD for the day. But this is my last post for this morning, I’m going to get up and around.


9 posted on 10/13/2011 3:33:54 AM PDT by SunkenCiv (It's never a bad time to FReep this link -- https://secure.freerepublic.com/donate/)
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To: ixtl

Thank you.


10 posted on 10/13/2011 5:42:59 PM PDT by bigheadfred (But alas)
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