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astrolabe
n. 古代的天体观测仪 古代的天体观测仪 astrolabe n 1: an early form of sextant 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 is now disused. [1913 Webster] Note: 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 It is now superseded by the quadrant and sextant.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]
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