Planisferic Astrolabe

The astrolabe is an astronomical calculating device used from ancient times into the eighteenth century. The name astrolabe comes from the Greek word for star astro and the Greek word Labio meaning that which seeks.

Measuring the height of a star using the back of the instrument, and knowing the latitude, one could find the time of night and the position of other stars. It may also be used for determining the time of day, or height of objects.

The openwork piece on the front, called the rete, is a star map of the northern sky. Pointers on the rete correspond to stars; the outermost circle is the Tropic of Capricorn, and the circle that is off-center represents the zodiac, the apparent annual motion of the sun. Engraved plates that fit below the rete have scales of altitude and azimuth (arc of the horizon) for specific latitudes. 

This beautiful instrument comes complete with wooden base and booklets on use and historical context. The wooden base is ideal for placement of a commemorative plaque in recognition of achievement or an event.

Max Height: 9.65"

Diameter: 7.87"

Thickness:0.28"