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ASTROLABE - Definiția din dicționar

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As"tro*labe (ăs"tr&ouptack_;*l&ā;b), n. [OE. astrolabie, astrilabe, OF. astrelabe, F. astrolabe, LL. astrolabium, fr. Gr. 'astrola`bon; 'a`stron star + &unr_;, &unr_;, to take.] 1. (Astron.) An instrument for observing or showing the positions of the stars. It is now disused.
[1913 Webster]

&hand_; Among the ancients, it was essentially the armillary sphere. A graduated circle with sights, for taking altitudes at sea, was called an astrolabe in the 18th century. It is now superseded by the quadrant and sextant.
[1913 Webster]

2. A stereographic projection of the sphere on the plane of a great circle, as the equator, or a meridian; a planisphere. Whewell.
[1913 Webster]