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— Dorsum = Astrolabe: Frontside —

Samll Astrolabe (ca. 1500 A.D.), origin probably Germany. All elements of the astrolabe are identified.

Front

The frontside is used to determine the time of the «true» sun for a particular date. In the day, the height above the horizon of the sun is measured, at night that of one or more of the 14 stars.

Reduced reconstruction. Diameter 100 mm (3.94"), weight 230 gr (8.1 oz.), brass (untreated). The drawing is not engraved but etched.

 
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