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[Crowned Greek astronomer Ptolemy and his Renaissance translator Regiomontanus, seated beneath an armillary sphere and surrounded by decorated border]

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Summary

Frontspiece in: Epytoma in Almagestum / Regiomontus. Venice : J. Hammam, 1496.

Published in: The tradition of science / Leonard C. Bruno. Washington, D.C. : Library of Congress, 1987, p. 29.

An armillary sphere is a model of the celestial sphere used to demonstrate the motions of the planets around the Sun. It consists of a set of rings representing the celestial equator, the ecliptic and other important circles on the celestial sphere, mounted on an axis. The rings can be rotated to show the positions of the stars and planets at different times and dates. Armillary spheres were used by ancient astronomers to study the movements of the heavens and are still used today as decorative objects or educational tools. Armillary spheres were first developed by ancient Greek astronomers, including Hipparchus and Ptolemy, in the 2nd century BC. They were later used by Chinese, Persian and Islamic astronomers. During the Renaissance, armillary spheres became popular with European scientists and were often incorporated into astronomical instruments and globes. Today, armillary spheres can be found in museums, observatories and private collections around the world. Some modern versions incorporate electronic sensors and motors to automate the movement of the rings.

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ptolemy active 2nd century regiomontanus joannes astronomy book illustrations greek astronomer greek astronomer ptolemy renaissance translator regiomontanus renaissance translator regiomontanus armillary sphere armillary sphere border vintage illustration finding our place in the cosmos from galileo to sagan and beyond rare books engraving italian planet prints planets decoration and ornament manuscripts illumination of books and manuscripts illuminated manuscripts library of congress
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Date

01/01/1496
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in collections

Armillary sphere

Model of objects in the sky consisting of a spherical framework of rings centred on the Earth or the Sun, representing lines of celestial longitude and latitude and other astronomically important features such as the ecliptic.
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Source

Library of Congress
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http://www.loc.gov/
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No known restrictions on publication.

label_outline Explore Astronomer, Sphere, Finding Our Place In The Cosmos From Galileo To Sagan And Beyond

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ptolemy active 2nd century regiomontanus joannes astronomy book illustrations greek astronomer greek astronomer ptolemy renaissance translator regiomontanus renaissance translator regiomontanus armillary sphere armillary sphere border vintage illustration finding our place in the cosmos from galileo to sagan and beyond rare books engraving italian planet prints planets decoration and ornament manuscripts illumination of books and manuscripts illuminated manuscripts library of congress