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Topics: Celestial Body Astronomical Planet Object Astronomy Describing...

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Celestial globeThroughout Chinese history, astronomers have created celestial globes to assist the observation of the stars. The earliest celestial globe was dated back to 52 BC in the West Han dynasty by the astronomers Geng Shou-chang and Luo-xia Hong . The first wate Celestial sphereIn astronomy and navigation, the celestial sphere is an imaginary rotating sphere of "gigantic radius", concentric with the Earth. All objects in the sky can be thought of as lying upon the sphere. Projected, from their corresponding terran equivalents, a Celestial poleThe two celestial poles are the imaginary points where the Earth's spin axis intersects the celestial sphere. The sky appears to drift overhead from east to west, completing a full circuit around the sky in 24 ( sidereal) hours. This phenomenon is due to Celestial coordinate systemIn astronomy, a celestial coordinate system is a coordinate system for mapping positions in the sky. There are different celestial coordinate systems each using a coordinate grid projected on the celestial sphere, in analogy to the geographic coordinate s Celestial mechanicsCelestial Mechanics Astrodynamics Celestial mechanics is a term for the application of physics, historically Newtonian mechanics, to astronomical objects such as stars and planets. After Einstein explained the anomalous precession of Mercury's perihelion, Celestial navigationCelestial navigation is a position fixing technique that was the first system devised to help sailors locate themselves on a featureless ocean. Celestial navigation uses angular measurements (sights) between the horizon and a common celestial object. Celestial equator Celestial body Celestial body atmosphere Celestial observation Celestial Intervention Agency Celestial Chorus Celestial Kingdom Celestial spheres Celestial event