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Jan 6 2006, 08:55 PM
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Senior Member Group: Members Posts: 2454 Joined: 8-July 05 From: NGC 5907 Member No.: 430 |
ADMIN NOTE: Please note that this topic was unavoidably poltical before the 'No Politics' rule. Please restrict future comments to the mission/spacecraft/news updates etc.
WHAT'S NEW Robert L. Park Friday, 6 Jan 06 Washington, DC DEEP SPACE CLIMATE OBSERVATORY KILLED. http://bobpark.physics.umd.edu/index.html -------------------- "After having some business dealings with men, I am occasionally chagrined,
and feel as if I had done some wrong, and it is hard to forget the ugly circumstance. I see that such intercourse long continued would make one thoroughly prosaic, hard, and coarse. But the longest intercourse with Nature, though in her rudest moods, does not thus harden and make coarse. A hard, sensible man whom we liken to a rock is indeed much harder than a rock. From hard, coarse, insensible men with whom I have no sympathy, I go to commune with the rocks, whose hearts are comparatively soft." - Henry David Thoreau, November 15, 1853 |
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Sep 3 2018, 01:14 PM
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Senior Member Group: Members Posts: 1669 Joined: 5-March 05 From: Boulder, CO Member No.: 184 |
To help with rendering the Earth, a guideline I've come across is that the chromaticity of the blue sky (due to Rayleigh scattering) should be about x=0.23 and y=0.23. This helps quantify the relative values of RGB in the clear sky portion of Earth images. This is assuming that the standard CIE color matching functions are correct in describing how this color is perceived.
A relation that I hadn't before known is that this "Rayleigh Blue" color is about the same color a star would have with an infinite (or very high) blackbody temperature. Thus on an imaginary planet orbiting a very early type O star a water cloud there would be about the same color as a haze free blue sky on Earth, instead of white. -------------------- Steve [ my home page and planetary maps page ]
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