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- Horizontal_coordinate_system abstract "The horizontal coordinate system is a celestial coordinate system that uses the observer's local horizon as the fundamental plane. This coordinate system divides the sky into the upper hemisphere where objects are visible, and the lower hemisphere where objects cannot be seen since the earth is in the way. The great circle separating hemispheres is called celestial horizon or rational horizon. The pole of the upper hemisphere is called the zenith. The pole of the lower hemisphere is called the nadir. The horizontal coordinates are: Altitude (Alt), sometimes referred to as elevation, is the angle between the object and the observer's local horizon. For visible objects it is an angle between 0 degrees to 90 degrees. Azimuth (Az), that is the angle of the object around the horizon, usually measured from the north increasing towards the east. Exceptions are, for example, ESO's FITS convention where it is measured from the south increasing towards the west, or the FITS convention of the SDSS where it is measured from the south increasing towards the east. Zenith distance, the distance from directly overhead (i.e. the zenith) is sometimes used instead of altitude in some calculations using these coordinates. The zenith distance is the complement of altitude (i.e. 90°-altitude).The horizontal coordinate system is sometimes also called the az/el system, the Alt/Az system, or the altazimuth system (from the name of the altazimuth mount for telescopes, whose two axes follow altitude and azimuth).".
- Horizontal_coordinate_system thumbnail Azimuth-Altitude_schematic.svg?width=300.
- Horizontal_coordinate_system wikiPageExternalLink watch?v=nA8CCqA-JlY.
- Horizontal_coordinate_system wikiPageID "48386".
- Horizontal_coordinate_system wikiPageRevisionID "567171969".
- Horizontal_coordinate_system hasPhotoCollection Horizontal_coordinate_system.
- Horizontal_coordinate_system subject Category:Celestial_coordinate_system.
- Horizontal_coordinate_system subject Category:Horizontal_coordinate_system.
- Horizontal_coordinate_system comment "The horizontal coordinate system is a celestial coordinate system that uses the observer's local horizon as the fundamental plane. This coordinate system divides the sky into the upper hemisphere where objects are visible, and the lower hemisphere where objects cannot be seen since the earth is in the way. The great circle separating hemispheres is called celestial horizon or rational horizon. The pole of the upper hemisphere is called the zenith.".
- Horizontal_coordinate_system label "Coordenadas horizontales".
- Horizontal_coordinate_system label "Horizontal coordinate system".
- Horizontal_coordinate_system label "Sistema horizontal de coordenadas".
- Horizontal_coordinate_system label "Système de coordonnées horizontales".
- Horizontal_coordinate_system label "Układ współrzędnych horyzontalnych".
- Horizontal_coordinate_system label "Горизонтальная система координат".
- Horizontal_coordinate_system label "地平坐標系".
- Horizontal_coordinate_system label "地平座標".
- Horizontal_coordinate_system sameAs Οριζόντιες_συντεταγμένες.
- Horizontal_coordinate_system sameAs Coordenadas_horizontales.
- Horizontal_coordinate_system sameAs Système_de_coordonnées_horizontales.
- Horizontal_coordinate_system sameAs 地平座標.
- Horizontal_coordinate_system sameAs 지평_좌표.
- Horizontal_coordinate_system sameAs Układ_współrzędnych_horyzontalnych.
- Horizontal_coordinate_system sameAs Sistema_horizontal_de_coordenadas.
- Horizontal_coordinate_system sameAs m.0cysv.
- Horizontal_coordinate_system sameAs Q625696.
- Horizontal_coordinate_system sameAs Q625696.
- Horizontal_coordinate_system wasDerivedFrom Horizontal_coordinate_system?oldid=567171969.
- Horizontal_coordinate_system depiction Azimuth-Altitude_schematic.svg.
- Horizontal_coordinate_system isPrimaryTopicOf Horizontal_coordinate_system.
