Celestial sphere
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 Celestial globe by Jost Bürgi (1594) |
In astronomy and navigation, the celestial sphere is an imaginary sphere of arbitrarily large radius, concentric with the observer. 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 is a practical tool for spherical astronomy, allowing observers to plot positions of objects in the sky when their distances are unknown or unimportant.
- Related: Celestial coordinate system, Celestial spheres, Firmament, History of astronomy, Sky, Spherical astronomy
| MEASURING THE SKY A Quick Guide to the Celestial S... MEASURING THE SKY A Quick Guide to the Celestial Sphere stars.astro.illinois.edu/celsph.html - Web |
| General Astronomy/The Celestial Sphere General Astronomy/The Celestial Sphere en.wikibooks.org/wiki/General_Astronomy/The_Celestial_Sphere - Web |
| Rotating Sky Explorer Rotating Sky Explorer astro.unl.edu/naap/motion2/animations/ce_hc.html - Web |
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| Interactive Sky Chart Interactive Sky Chart skyandtelescope.com/observing/skychart/# - Web |
| Monthly skymaps Monthly skymaps astroclub.tau.ac.il/skymaps/monthly/ - Web |
