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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
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.
A volvelle from the sixteenth century edition of the De sphaera mundi by Johannes de Sacrobosco.
A volvelle from the sixteenth century edition of the De sphaera mundi by Johannes de Sacrobosco.
Petrus Apianus
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Petrus Apianus, also known as Peter Apian, Peter Bennewitz, and Peter Bienewitz, was a German humanist, known for his works in mathematics, astronomy and cartography. His work on "cosmography", the fi
Apianus on a 16th-century engraving by Theodor de Bry
Apianus on a 16th-century engraving by Theodor de Bry
Arms of coat of nobility Apian in Leisnig, Saxony
Arms of coat of nobility Apian in Leisnig, Saxony
Folium populi, 1533
Folium populi, 1533