astrolabe

1. n. An instrument for observing or showing the positions of the stars. It is now disused. Source: opted

2. n. A stereographic projection of the sphere on the plane of a great circle, as the equator, or a meridian; a planisphere. Source: opted

3. n. an early form of sextant Source: wordnet

4. 1. (Astron.) An instrument for observing or showing the positions of the stars. It is now disused. 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 It is now superseded by the quadrant and sextant. 2. A stereographic projection of the sphere on the plane of a great circle, as the equator, or a meridian; a planisphere. Whewell. Source: webster

5. An instrument for observing or showing the positions of thestars. It is now disused. Source: adambom

6. n:100 n. an early form of sextant Source: ecdict

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