Sky
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The sky is an unobstructed view upward from the surface of the Earth. It includes the atmosphere and outer space. It may also be considered a place between the ground and outer space, thus distinct fr
The night sky over Slovenia in July
Cirriform clouds and a quarter Moon in the blue daytime sky over Germany
Sky during day time
The crescent Moon remains visible just moments before sunrise.
Celestial sphere
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In astronomy and navigation, the celestial sphere is an abstract sphere that has an arbitrarily large radius and is concentric to Earth. All objects in the sky can be conceived as being projected upon
Sky
…also be considered a place between the ground and outer space, thus distinct from outer space. In the field of astronomy, the sky is also called the celestial sphere. This is an abstract sphere, concentric to the Earth, on which the Sun, Moon, planets, and stars appear to be drifting. The celestial sphere is…
Celestial globe by Jost Bürgi (1594)