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celestial sphere

celestial sphere MIL

celestial sphere ASTRON

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The first image shows the celestial sphere from the outside, with the constellations in mirror image. en.wikipedia.org

The celestial sphere, still used for teaching purposes and sometimes for navigation, is also based on a geocentric system which in effect ignores parallax. en.wikipedia.org

In medieval cosmology, the sump was the center of the cosmos, where the dregs and filth descended, with the celestial sphere far exalted above the world of fallen man. en.wikipedia.org

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