Definitions for "Astrolabe"
Astrolabe is a collection of subroutines and applications for calculating the positions of the sun, moon, planets and other celestial objects. The emphasis is on high accuracy over a several thousand year time span.
An instrument for observing or showing the positions of the stars. It is now disused.
A stereographic projection of the sphere on the plane of a great circle, as the equator, or a meridian; a planisphere.
a portable device for solving practical questions in astronomy, such as working out the time of day or night
Keywords:  angle, vertical, device, measuring
a vertical angle measuring device