Used in navigation until the invention of the sextant, this ancient instrument measures the angular height of a celestial object. It is a complete or partial circle, marked off in degrees, with a movable arm pivoted at the center of the complete or partial circle.
   The zero point on the circle is oriented with the horizon and a celestial object is sighted along the arm. This gives the objects azimuth or altitude.

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  • ASTROLABE — Le «preneur d’étoiles» (astrolabos ), en forme de disque, est la combinaison d’un instrument de mesure et d’un système de projection stéréographique. L’astrolabe planisphère de Ptolémée (IIe s.) présente une face graduée qui porte une alidade:… …   Encyclopédie Universelle

  • Astrolabe — ist der Name dreier französischer Forschungsschiffe: Astrolabe (1781), eine umgebaute Fleute der französischen Marine Astrolabe (1811), das Schiff Jules Dumont d Urvilles auf seiner Antarktisexpedition Astrolabe (1986), ein Eisbrecher im aktiven… …   Deutsch Wikipedia

  • Astrolabe — As tro*labe ([a^]s tr[ o]*l[=a]b), n. [OE. astrolabie, astrilabe, OF. astrelabe, F. astrolabe, LL. astrolabium, fr. Gr. astrola bon; a stron star + ?, ?, to take.] 1. (Astron.) An instrument for observing or showing the positions of the stars. It …   The Collaborative International Dictionary of English

  • astrolabe — ASTROLABE. s. mas. Instrument Astronomique, dont on se sert pour observer la hauteur des Astres. Traité de l usage de l Astrolabe. On donne aussi le nom d Astrolabe à certaines projections de la Sphère …   Dictionnaire de l'Académie Française 1798

  • astrolabe — Astrolabe. s. m. Instrument Astronomique, qui est un plan sur lequel sont decrits plusieurs cercles servant à faire des observations Astronomiques. Traité de l usage de l Astrolabe …   Dictionnaire de l'Académie française

  • astrolabe — mid 14c., from O.Fr. astrelabe, from M.L. astrolabium, from Gk. astrolabos (organon) star taking (instrument), from astron star (see ASTRO (Cf. astro )) + lambanien to take (see ANALEMMA (Cf. analemma)) …   Etymology dictionary

  • astrolabe — ► NOUN ▪ an instrument formerly used for making astronomical measurements and in navigation for calculating latitude. ORIGIN Latin astrolabium, from Greek astrolabos star taking …   English terms dictionary

  • astrolabe — [as′trō lāb΄, as′trəlāb΄] n. [ME astrelabie < OFr astrelabe < ML astrolabium < Gr astrolabon < astron, STAR + lambanein, to take: see LATCH] an instrument formerly used to find the altitude of a star, etc.: it was replaced by the… …   English World dictionary

  • Astrolabe — Pour les articles homonymes, voir Astrolabe (homonymie) et L Astrolabe. Astrolabe perse du XVIIIe siècle …   Wikipédia en Français

  • Astrolabe — The astrolabe is a historical astronomical instrument used by classical astronomers, navigators, and astrologers. Its many uses included locating and predicting the positions of the Sun, Moon, planets and stars; determining local time given local …   Wikipedia

  • astrolabe — astrolabical /as treuh lab i keuhl, lay bi /, adj. /as treuh layb /, n. an astronomical instrument for taking the altitude of the sun or stars and for the solution of other problems in astronomy and navigation: used by Greek astronomers from… …   Universalium

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