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APOD: Bright Sun and Crescent Earth (2009 Nov 30)
Posted: Mon Nov 30, 2009 2:45 pm
by orin stepanek
http://apod.nasa.gov/apod/ap091130.html
When I was a Kid; space flight was just an imaginative dream. Today we think nothing of another Shuttle flight. Awesome shots like this one and from Hubble are now commonplace. 8)
Orin
Re: Bright Sun And Crescent Earth (2009 Nov 30)
Posted: Mon Nov 30, 2009 4:08 pm
by neufer
- -------------------------------------------
. A Midsummer Night's Dream > Act V, scene I
Moonshine: This lanthorn doth the horned moon present;--
DEMETRIUS: He should have worn the horns on his head.
THESEUS: He is no crescent, and his horns are
. invisible within the circumference.
Moonshine: This lanthorn doth the horned moon present;
. Myself the man i' the moon do seem to be.
THESEUS: This is the greatest error of all the rest:
. the man should be put into the lanthorn.
. How is it else the man i' the moon?
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. Hamlet > Act I, scene III
LAERTES: For nature, crescent, does not grow alone
. In thews and bulk, but, as this temple waxes,
. The inward service of the mind and soul
. Grows wide withal.
-------------------------------------------
Crescent, n. [OE. cressent, cressaunt, crescent (in sense 1), OF. creissant increasing, F. croissant, p. pr. of crotre, OF. creistre, fr. L. crescere to increase, v. incho.; akin to creare to create. cf. Accrue, Increase, Crescendo.]
1. The increasing moon; the moon in her first quarter, or when defined by a concave and a convex edge;
. also, applied improperly to the old or decreasing [decrescent] moon in a like state.
2. Anything having the shape of a crescent or new moon.
3. A representation of the increasing moon, often used as an emblem or badge; as:
(a) A symbol of Artemis, or Diana.
(b) The ancient symbol of Byzantium or Constantinople. Hence:
(c) The emblem of the Turkish Empire, adopted after the taking of Constantinople.
- <<Crescent Tradition says that "Philip, the father of Alexander, meeting with great difficulties in the siege of Byzantium, set the workmen to undermine the walls, but a crescent moon discovered the design, which miscarried; consequently the Byzantines erected a statue to Diana, and the crescent became the symbol of the state.">>
4. Any one of three orders of knighthood.
5. (Her.) The emblem of the increasing moon with horns directed upward, when used in a coat of arms;
-- often used as a mark of cadency to distinguish a second son and his descendants.
http://antwrp.gsfc.nasa.gov/apod/ap091123.html
http://antwrp.gsfc.nasa.gov/apod/ap030621.html
http://antwrp.gsfc.nasa.gov/apod/ap091110.html
http://antwrp.gsfc.nasa.gov/apod/ap080126.html
http://antwrp.gsfc.nasa.gov/apod/ap071023.html
http://antwrp.gsfc.nasa.gov/apod/ap060618.html
http://antwrp.gsfc.nasa.gov/apod/ap051205.html
http://antwrp.gsfc.nasa.gov/apod/ap050329.html
http://antwrp.gsfc.nasa.gov/apod/ap030309.html
Re: Bright Sun And Crescent Earth (2009 Nov 30)
Posted: Mon Nov 30, 2009 7:32 pm
by geckzilla
Isn't it strange how brightly illuminated the solar panels are considering we are looking at the shadowed side of them? There must be a substantial reflection shining on them. Or they are more translucent than I thought.
Re: Bright Sun And Crescent Earth (2009 Nov 30)
Posted: Mon Nov 30, 2009 8:49 pm
by neufer
geckzilla wrote:Isn't it strange how brightly illuminated the solar panels are considering we are looking at the shadowed side of them? There must be a substantial reflection shining on them. Or they are more translucent than I thought.
Oh, dear!
They'll just have to go back to the studio and do another take.
Re: Bright Sun And Crescent Earth (2009 Nov 30)
Posted: Tue Dec 01, 2009 1:45 am
by rstevenson
geckzilla wrote:Isn't it strange how brightly illuminated the solar panels are considering we are looking at the shadowed side of them? There must be a substantial reflection shining on them. Or they are more translucent than I thought.
This APOD might give you a better idea of what is illuminating them.
Rob
Re: Bright Sun And Crescent Earth (2009 Nov 30)
Posted: Tue Dec 01, 2009 2:28 am
by geckzilla
Yeah, I know they're attached to a fairly large structure, but still. The lighting is playing tricks on me. I've decided it's not as much reflection as it is the panels aren't opaque. I'm not that familiar with solar panels.
Re: Bright Sun And Crescent Earth (2009 Nov 30)
Posted: Tue Dec 01, 2009 5:05 am
by Chris Peterson
geckzilla wrote:Yeah, I know they're attached to a fairly large structure, but still. The lighting is playing tricks on me. I've decided it's not as much reflection as it is the panels aren't opaque. I'm not that familiar with solar panels.
The PV panels are opaque. They are illuminated here by the reflected light of the ISS. Note the other areas of the ISS in this image that are shadowed from sunlight, but which are still quite well lit.
Re: Bright Sun And Crescent Earth (2009 Nov 30)
Posted: Tue Dec 01, 2009 4:25 pm
by geckzilla
Chris, why do they take on an orange tint from the shadowed side? Especially in
this picture? Are they black on one side and orange on the other?
Re: Bright Sun And Crescent Earth (2009 Nov 30)
Posted: Tue Dec 01, 2009 4:38 pm
by neufer
geckzilla wrote: why do they take on an orange tint from the shadowed side? Especially in
this picture?
Copper “roll rings”
Re: Bright Sun And Crescent Earth (2009 Nov 30)
Posted: Tue Dec 01, 2009 4:44 pm
by Chris Peterson
geckzilla wrote:Chris, why do they take on an orange tint from the shadowed side? Especially in
this picture? Are they black on one side and orange on the other?
They are a deep blue/black on their active side (makes sense: any light you reflect away isn't getting converted to electricity). I'm not sure about the back, but the pictures certainly seem to show an orange cast. That's pretty common with space-based systems. Kapton (an orange polymer film) is used for wrapping cables, providing insulation, covering surfaces, and all sorts of things. Gold-colored passivation coatings (anodizing and the like) are common on metal surfaces. And depending on how the cells are mounted, we might even see their backs directly, and semiconductor substrates can have a yellow cast.
Re: Bright Sun And Crescent Earth (2009 Nov 30)
Posted: Fri Jan 15, 2010 10:22 pm
by Stannex
I was looking at this image and noticed that in the lens flare around the sun there seem to be some partial inverted letter shapes. I'm guessing that's a reflection of some computer screen inside the shuttle ... but wondered if Chris (or anyone else) could give a more detailed description of what that is.
Thanks.
Re: Bright Sun And Crescent Earth (2009 Nov 30)
Posted: Fri Jan 15, 2010 10:43 pm
by Chris Peterson
Stannex wrote:I was looking at this image and noticed that in the lens flare around the sun there seem to be some partial inverted letter shapes. I'm guessing that's a reflection of some computer screen inside the shuttle ... but wondered if Chris (or anyone else) could give a more detailed description of what that is.
I think it's probably a reflection of the rim of the camera lens in the window.
Nikon-o-glassed
Posted: Sat Jan 16, 2010 2:19 am
by neufer
Chris Peterson wrote:Stannex wrote:I was looking at this image and noticed that in the lens flare around the sun there seem to be some partial inverted letter shapes. I'm guessing that's a reflection of some computer screen inside the shuttle ... but wondered if Chris (or anyone else) could give a more detailed description of what that is.
I think it's probably a reflection of the rim of the camera lens in the window.
- ICON, n. [L., fr. Gr.] An image or representation; a portrait or pretended portrait.
ICONoclast, n. [Gr. image + to break: cf. F. iconoclaste.]
1. A breaker or destroyer of images or idols; a determined enemy of idol worship.
2. One who exposes or destroys impositions or shams; one who attacks cherished beliefs.
http://www.nikon.com/about/news/2009/1221_NASA-D3S_01.htm wrote:
<<During World War II the Nippon Kōgaku company grew to 19 factories and 23,000 employees, supplying items such as binoculars, lenses, bomb sights, and periscopes to the Japanese military. The name
NIKON dates from 1946 from a merging of Nippon Kōgaku and an imitation of
ZEISS IKON. In 1948, the first Nikon-branded camera was released, the Nikon I. Nikon lenses were popularised by the American photojournalist
David Douglas Duncan's use at the time of the Korean War. Fitting Nikon optics to his Leica rangefinder cameras produced high contrast negatives with very sharp resolution at the centre field.>>