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Celestial Sphere: Difference between revisions
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(Created page with "[[File:Earth within celestial sphere.gif|thumb|Earth rotating within a relatively small-radius geocentric celestial sphere. Shown here are stars (white), the ecliptic (red, the circumscription of the Sun's apparent annual track), and the lines of right ascension and circles of declination (cyan) of the equatorial coordinate system.<ref>[https://en.wikipedia.org/wiki/Celestial_sphere#/media/File:Earth_within_celestial_sphere.gif]</ref> In astronomy and navigation, the C...") |
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[[File:Earth within celestial sphere.gif|thumb|Earth rotating within a relatively small-radius geocentric celestial sphere. Shown here are stars (white), the ecliptic (red, the circumscription of the Sun's apparent annual track), and the lines of right ascension and circles of declination (cyan) of the equatorial coordinate system.<ref>[https://en.wikipedia.org/wiki/Celestial_sphere#/media/File:Earth_within_celestial_sphere.gif]</ref> | [[File:Earth within celestial sphere.gif|thumb|Earth rotating within a relatively small-radius geocentric celestial sphere. Shown here are stars (white), the ecliptic (red, the circumscription of the Sun's apparent annual track), and the lines of right ascension and circles of declination (cyan) of the equatorial coordinate system.<ref>[https://en.wikipedia.org/wiki/Celestial_sphere#/media/File:Earth_within_celestial_sphere.gif]</ref>]] | ||
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 the inner surface of the celestial sphere, which may be centered on Earth or the observer. If centered on the observer, half of the sphere would resemble a hemispherical screen over the observing location. | 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 the inner surface of the celestial sphere, which may be centered on Earth or the observer. If centered on the observer, half of the sphere would resemble a hemispherical screen over the observing location. | ||