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As"trolabe
(s"trlb), 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 is now disused.
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 It is now superseded by the quadrant and sextant.
2. A stereographic projection of the sphere on the plane of a great circle, as the equator, or a meridian; a planisphere. Whewell.
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