Figure 1. Planispherical astrolabe. Marocco, 16th century. Engraved brass. On display at Paris naval Museum.
Whether you’re an astronomer, astrologer or steampunk fan, you’re bound to fall in love with this ancient analog computer. Even better, you can make one for yourself by downloading the directions from the Resources section below.
The astrolabe is an ingenius device used for nearly two thousands years, from the time of Hipparchus (c. 190 – 120 BCE) until the turn of the 17th century. It’s typically a disc constructed from wood or brass, about 10 – 20 centimeters in diameter, and a few millimeters thick. In 1391, medieval writer and poet, Geoffrey Chaucer, wrote a treatise on the subject for his son, describing how to build one as well as its use. Astrolabes had over a thousand uses, including timekeeping, navigation, surveying, solving equations, and so forth. Mastering them all required an entire university…
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