In astronomy and navigation, the celestial sphere is an imaginary sphere of arbitrarily large radius, concentric with a particular celestial body. All objects in the observer`s sky can be thought of as projected upon the inside surface of the celestial sphere, as if it were the underside of a dome or a hemispherical screen. The celestial sphere i....
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http://en.wikipedia.org/wiki/Celestial_sphere
is an imaginary sphere that covers the entire sky and is stationary with respect to the background stars. It is used as a tool for spherical astronomy.
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http://en.wikipedia.org/wiki/Glossary_of_astronomy
An imaginary sphere on which the heavenly bodies are supposed to lie
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http://jot101.com/2015/05/a-z-of-science-fiction-words/
The apparent sphere of sky that surrounds the Earth; used as a convention for specifying the location of a celestial object.
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http://www.braeunig.us/space/glossary.htm
the apparent surface of the heavens, on which the stars seem to be fixed. For the purpose of establishing coordinate systems to mark the positions ... [3 related articles]
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http://www.britannica.com/eb/a-z/c/42
The imaginary sphere upon whose inner surface celestial objects can be considered to lie for the purpose of describing their position. The celestial sphere is centered on the origin of whatever system of celestial coordinates is being used. The celestial axis is the projection of Earth`s rota...
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An imaginary sphere that surrounds the Earth, the Earth being at the centre of that sphere.
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The projection of space onto an imaginary hollow sphere of infinite radius surrounding the Earth but centred on the observer. (First postulated by Ptolemy.) It is the basis of sky charts, and the celestial co-ordinate system. The coordinate system most commonly used is right ascension and declination. The sphere itself is split up into arbitrary ar…
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An imaginary sphere around the Earth on which the stars and planets appear to be positioned.
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http://www.seasky.org/astronomy/astronomy-glossary.html
[
n] - the apparent surface of the imaginary sphere on which celestial bodies appear to be projected
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http://www.webdictionary.co.uk/definition.php?query=celestial%20sphere
An imaginary sphere of infinite radius centered on the Earth and poles aligned with the poles of the Earth.A point on the celestial sphere is really only a direction in space. Parallel lines meet the celestial sphere at the same point.
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sphere 1 empyrean noun the apparent surface of the imaginary sphere on which celestial bodies appear to be projected
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Imaginary sphere surrounding the Earth, on which the celestial bodies seem to lie. The positions of bodies such as stars, planets, and galaxies are specified by their coordinates on the celestial sphere. The equivalents of latitude and longitude on the celestial sphere are called declination and righ...
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An imaginary sphere surrounding the Earth. It is used to help astronomers explain where objects are found in the sky.
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https://www.encyclo.co.uk/local/22784
the imaginary spherical shell formed by the sky, usually represented as an infinite sphere, the center of which is a given observer's position.
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https://www.infoplease.com/dictionary/celestial-sphere
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