- Volvelle
Volvelles, also called wheel charts, are a type of
slide chart ,paper constructions with rotating parts. Volvelles have been produced to accommodate organization and calculation in many diverse subjects. Early examples of volvelles are found in the pages ofastronomy books. In the twentieth century, the volvelle had many diverse uses.In "Reinventing the Wheel", author
Jessica Helfand introduces twentieth-century volvelles with this:The rock band Led Zeppelin employed a volvelle in the sleeve design for the album "
Led Zeppelin III " (1970).Venus volvelle
The most ancient example of a simple volvelle was the pentagram from Hamurabi's day that has become the symbol of witchcraft. It is actually the path of Venus in 8 years and it does rotate in full circle in a span of 1199 or 1215 years. (1200 x 365 days or 5x 243 years) But owing to Venus averaging 583.92 days, the 750 synodic orbits in 1200 years (750x 584 days) has a correction of 60 days less, or 30 days less in 600 years. This is to be noted when the ancient Great Year of 600 years is said to be oriental, and the oriental calendar includes a 60-day cycle. However, the 600-year calendar (cycle) is assumed to be Jupiter by equating it with 12-year calendar.
References
* "Eye", No. 41, Vol. 11, edited by John L. Walters, Quantum Publishing, Autumn 2001.
See also
*
Slide chart External links
* [http://www.robertsabuda.com/everythingpopup/nycvolvelle.asp An exhibition of volvelles at New York's Grolier Club]
* [http://www.spamula.net/blog/2003/08/volvelles.html Astronomical volvelles of Petrus Apianus]
* [http://coldwarcalculators.blogspot.com/ Cold War volvelles]
* [http://addiator.blogspot.com/2008/02/volvelles-wheel-charts-and-slide-charts.html Slide Charts]
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