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astrolabe 中文解釋 wordnet sense Collocation Usage Collins Definition
Noun
/ˈastrəˌlāb/,
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astrolabes, plural;
  1. An instrument formerly used to make astronomical measurements, typically of the altitudes of celestial bodies, and in navigation for calculating latitude, before the development of the sextant. In its basic form (known from classical times), it consists of a disk with the edge marked in degrees and a pivoted pointer

  1. an early form of sextant
  2. An astrolabe (ἁστρολάβον astrolabon, "star-taker") is a historical astronomical instrument used by astronomers, navigators, and astrologers. ...
  3. An astronomical and navigational instrument for gauging the altitude of the Sun and stars
  4. An ancient instrument employed for measuring the angular position of Sun and stars, used also to project the celestial sphere on the plane of the equator.
  5. An Arabic medieval instrument invented to measure and predict the positions of the sun and major stars.
  6. A circular instrument used to observe and calculate the position of celestial bodies
  7. (From the Greek "astrer" [star] and "labin" [to take].) An astronomical instrument used by ancient Greeks and others to measure the height above the horizon of celestial bodies. ...
  8. astrolabe - an old instrument which measures the stars altitude (a simple sextant, for example). The basic astrolabe is made up of a disk hanging vertically with an alidad, which is rotated so that it can be directed to the star chosen. ...
  9. An instrument used to take altitudes and to solve other problems of practical astrology.
  10. A navigational instrument. It consisted of a dial, showing degrees, with an arm (alidade) pivoting through the centre. ...
  11. An instrument dating back to ancient Greek, Persian and Arab times for ascertaining the positions of the heavenly bodies. It was primitively a kind of sextant, made obsolete by the eventual introduction of the quadrant and sextant.
  12. Instrument which provided a flat representation of the skies, used to determine astronomical data (such as the altitude of the stars or the hour of day) and also used as a navigational aid. In addition, it provided astrological information for the drawing up of horoscopes.
  13. A device used to determine latitude by observing the altitude and position of the sun or other start or planet.
  14. A mechanical device, predecessor to the sextant, whereby mariners determined the time of day by the Sun, of the night by the stars, and the height and depth of mountains and valleys. The astrolabe of Christopher Columbus was on display at the Philadelphia Sesquicentennial. ...
  15. A device used by sailors to find out where they were by using the stars
  16. an early astronomical instrument in the form of a heavy disk (the mater) which was suspended vertically and had an angular scale marked around it (the limb).  A coplanar klimate and an alidade rotated about its centre. A fretted rete gave the positions of the brightest fixed stars. ...
  17. An ancient astronomical instrument that combines a planisphere with sights to enable one to compute astronomical problems and measure time. The instrument may have been invented by Hipparchus in the second century BCE.