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altazimuth coordinate system

altazimuth coordinate system (ăltăzˈəməth) [key] or horizon coordinate system, astronomical coordinate system in which the position of a body on the celestial sphere is described relative to an observer's celestial horizon and zenith. The coordinates of a body in this system are its altitude and azimuth. Altitude is measured from the celestial horizon along the vertical circle through the body and the zenith of the observer. Azimuth is measured along the celestial horizon from the observer's south point (the point on the horizon directly south of him) to the point where the body's vertical circle intersects the horizon. Because the earth rotates on its axis, the altitude and azimuth of a celestial body are constantly changing.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

More on altazimuth coordinate system from Infoplease:

  • horizon coordinate system - horizon coordinate system: horizon coordinate system: see altazimuth coordinate system.
  • celestial meridian - celestial meridian celestial meridian, vertical circlepassing through the north celestial pole and ...
  • azimuth - azimuth azimuth , in astronomy, one coordinate in the altazimuth coordinate system. It is the ...
  • vertical circle - vertical circle vertical circle, in astronomy, the great circle on the celestial sphere that passes ...
  • celestial horizon - celestial horizon celestial horizon, one axis of the altazimuth coordinate system. It is the great ...

See more Encyclopedia articles on: Astronomy: General

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