DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY
Armillary sphere. Earth. Developed by the Greeks, it was used as a teaching tool in the 3rd century BC by Ptolemy, to be resurrected by Copernicus in 1543 when he revived the idea of a heliocentric universe. It was an important symbol of the resurgence of science in Renaissance Europe.
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