·noun An instrument for observing or showing the positions of the stars. It is now disused.
II. Astrolabe ·noun A stereographic projection of the sphere on the plane of a great circle, as the equator, or a meridian; a planisphere.
An armillary sphere. ♦ Sea-astrolabe, a useful graduated brass ring, with a movable index, for tak...
The Sailor's Word-Book