Back نظام الإحداثيات الأفقية Arabic Coordenaes horizontales AST Гарызантальная сістэма каардынат Byelorussian Coordenades horitzontals Catalan Obzorníkové souřadnice Czech Horizontales Koordinatensystem German Οριζόντιες συντεταγμένες Greek Coordenadas horizontales Spanish Horisondilised koordinaadid Estonian Koordenatu horizontalen sistema Basque

Horizontal coordinate system

Not to be confused with Horizontal position representation.
Horizontal coordinates use a celestial sphere centered on the observer. Azimuth is measured eastward from the north point (sometimes from the south point) of the horizon; altitude is the angle above the horizon.

The horizontal coordinate system is a celestial coordinate system that uses the observer's local horizon as the fundamental plane to define two angles of a spherical coordinate system: altitude and azimuth. Therefore, the horizontal coordinate system is sometimes called the az/el system,[1] the alt/az system, or the alt-azimuth system, among others. In an altazimuth mount of a telescope, the instrument's two axes follow altitude and azimuth.[2]

  1. ^ Cite error: The named reference Keck-Az-El was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference Britannica-horizon-system was invoked but never defined (see the help page).
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