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Sun printing may also refer to a photographic process using potassium dichromate which produces a negative plate for conventional lithographic printing. The process uses a film of gelatine spread on a flat and rigid surface. This is coated with a dilute solution of potassium dichromate and dried in low light conditions.
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Although named “héliographie” by Niépce, in the later 19th century “heliography” was used generally for all “sun-printing;” with “heliographic processes” coining to mean specifically the reprographic copying for line, rather than continuous tone, images. [11]
Afternoon analemma photo taken in 1998–99 in Murray Hill, New Jersey, U.S., by Jack Fishburn.The Bell Laboratories building is in the foreground. In astronomy, an analemma (/ ˌ æ n ə ˈ l ɛ m ə /; from Ancient Greek ἀνάλημμα (analēmma) 'support') [a] is a diagram showing the position of the Sun in the sky as seen from a fixed location on Earth at the same mean solar time over ...
An amazing picture of the sun and the earth. The thing that I like the most is that you can get a feeling of size and scale in the solar system when you look at how tiny the earth looks besides it. It really gives you a sense of Humility. Really informative in my opinion. It appears in the Sun article and was created by brian0918 with NASA images.
Date/Time Thumbnail Dimensions User Comment; current: 20:35, 29 September 2021: 512 × 512 (923 bytes): Vizorsols: Fixed asymmetry on minor rays; made tip length exactly 17px
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