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单词 altazimuth
释义

Definition of altazimuth in English:

altazimuth

noun alˈtazɪməθælˈtæzəməθ
  • 1Astronomy
    A telescope mounting that moves in azimuth (about a vertical axis) and in altitude (about a horizontal axis).

    Compare with equatorial mount
    Example sentencesExamples
    • Even with this disadvantage, the altazimuth mounting will be the primary mounting for very large telescopes to be constructed in the future.
    • However, in recent years computerized altazimuth mounts have appeared which use motors to automatically compensate for the sky's motion, though these are generally a great deal more expensive.
    • Scopes with altazimuth mounts are easy to set up and use, and require no special expertise to use properly.
    • While the altitude axis of an altazimuth mount may bend, the bending is constant and can be compensated by realignment of the tube or optics.
    • The Dobsonian design is the most popular type of altazimuth mounting used on astronomical telescopes.
    1. 1.1 A telescope on an altazimuth mounting.
      Example sentencesExamples
      • A lot of my variables are near bright stars or distinctive star patterns; thus easy to find with my noncomputerized altazimuth telescope or binoculars.
      • All are fully-steerable altazimuth telescopes capable of pointing and tracking over zenith angles from 1 to 60 degrees.
      • Another highly entertaining presentation was by Dennis di Cicco of Sky and Telescope magazine as he described his construction of a 16-inch ‘sidewalk’ altazimuth telescope.
      • Of course, everything below about 80 degrees altitude was very easy to find; all altazimuth telescopes have this quirk.
      • Since altazimuth telescope mounts usually have a limit in their ability to track high elevation passes through culmination, especially at near-zenith transits because of the large azimuth swings required, the mount can start falling behind.
  • 2A surveying instrument for measuring vertical and horizontal angles, resembling a theodolite but larger and more precise.

    Example sentencesExamples
    • This is an altazimuth theodolite of an improved pattern now used on the Ordnance Survey.

Origin

Mid 19th century: blend of altitude and azimuth.

 
 

Definition of altazimuth in US English:

altazimuth

nounalˈtazəməTHælˈtæzəməθ
  • 1Astronomy
    A telescope mounting that moves in azimuth (about a vertical axis) and in altitude (about a horizontal axis).

    Compare with equatorial mount
    Example sentencesExamples
    • The Dobsonian design is the most popular type of altazimuth mounting used on astronomical telescopes.
    • Scopes with altazimuth mounts are easy to set up and use, and require no special expertise to use properly.
    • While the altitude axis of an altazimuth mount may bend, the bending is constant and can be compensated by realignment of the tube or optics.
    • However, in recent years computerized altazimuth mounts have appeared which use motors to automatically compensate for the sky's motion, though these are generally a great deal more expensive.
    • Even with this disadvantage, the altazimuth mounting will be the primary mounting for very large telescopes to be constructed in the future.
    1. 1.1 A telescope on an altazimuth mounting.
      Example sentencesExamples
      • A lot of my variables are near bright stars or distinctive star patterns; thus easy to find with my noncomputerized altazimuth telescope or binoculars.
      • All are fully-steerable altazimuth telescopes capable of pointing and tracking over zenith angles from 1 to 60 degrees.
      • Another highly entertaining presentation was by Dennis di Cicco of Sky and Telescope magazine as he described his construction of a 16-inch ‘sidewalk’ altazimuth telescope.
      • Since altazimuth telescope mounts usually have a limit in their ability to track high elevation passes through culmination, especially at near-zenith transits because of the large azimuth swings required, the mount can start falling behind.
      • Of course, everything below about 80 degrees altitude was very easy to find; all altazimuth telescopes have this quirk.
  • 2A surveying instrument for measuring vertical and horizontal angles, resembling a theodolite but larger and more precise.

    Example sentencesExamples
    • This is an altazimuth theodolite of an improved pattern now used on the Ordnance Survey.

Origin

Mid 19th century: blend of altitude and azimuth.

 
 
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更新时间:2024/12/23 20:07:20