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WikiVisually
The entire wiki reimagined as a visual magazine with video discovery · Watch your interests come alive
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De sphaera mundi
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De sphaera mundi is a medieval introduction to the basic elements of astronomy written by Johannes de Sacrobosco c. 1230. Based heavily on Ptolemy's Almagest, and drawing additional ideas from Islamic
A volvelle from a sixteenth-century edition of Sacrobosco's De Sphaera
A volvelle from a sixteenth-century edition of Sacrobosco's De Sphaera
Picture from a 1550 edition of De sphaera, showing how the curvature of the Earth makes the mast of an approaching ship appear first
Picture from a 1550 edition of De sphaera, showing how the curvature of the Earth makes the mast of an approaching ship appear first
Clockwork universe
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The clockwork universe is a concept which compares the universe to a mechanical clock. It continues ticking along, as a perfect machine, with its gears governed by the laws of physics, making every as
De sphaera mundi
…suggesting that the reported eclipse of the Sun at the crucifixion of Jesus was a disturbance of the order of that machine. This concept is similar to the clockwork universe analogy that became very popular centuries later, during the Enlightenment. Though principally about the universe, De sphaera 1230 A.D. contains a clear…
Tim Wetherell's Clockwork Universe sculpture at Questacon, Canberra, Australia (2009)
Tim Wetherell's Clockwork Universe sculpture at Questacon, Canberra, Australia (2009)