Also known as wheel chart, voluelle, volvell
thumb|A 15th century volvella of the moon upright|thumb|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.]] upright|thumb|A volvelle from the sixteenth century edition of the De sphaera mundi by [[Johannes de Sacrobosco.]]
~2 min read
thumb|A 15th century volvella of the moon upright|thumb|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.]] upright|thumb|A volvelle from the sixteenth century edition of the De sphaera mundi by [[Johannes de Sacrobosco.]]
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 organization and calculation in many diverse subjects. Early examples of volvelles are found in the pages of astronomy books.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).