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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
Volvelle
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A volvelle or wheel chart is a type of slide chart, a paper construction with rotating parts. It is considered an early example of a paper analog computer. Volvelles have been produced to accommodate
De sphaera mundi
…A volvelle from a sixteenth-century edition of Sacrobosco's De Sphaera De sphaera mundi (Latin title meaning On the Sphere of the World, sometimes rendered The…
A 15th century volvella of the moon
A 15th century volvella of the moon
A sixteenth-century wheel chart, a page of Astronomicum Caesareum by Petrus Apianus, 1540, apparently relating to the Moon. The red dragons mark out o
A sixteenth-century wheel chart, a page of Astronomicum Caesareum by Petrus Apianus, 1540, apparently relating to the Moon. The red dragons mark out one odd-sized and 26 equal-sized central divisions; the orbital period of the moon is 27.3 days.