Article ID: CBB503722580

A hidden volvelle in Petrus Apianus' Astronomicum Caesareum (2022)

unapi

We analyse a volvelle hidden under the top disks of one of the volvelles in Petrus Apianus' Astronomicum Caesareum. It turns out that this volvelle, completed with an overlay disk with the ecliptic, can be used to compute the rising and setting signs in the zodiac given the latitude of a locality, the longitude of the Sun, and the hour of the day. It is based on a standard stereographic projection normally used for astrolabes but the volvelle instead projects a set of curves for different local horizons. This paper gives an analysis of the volvelle and an explanation of its use and working, and also makes some speculations on its background.

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Authors & Contributors
Gislén, Lars
Dekker, Elly
Gianfranco Crupi
Wells, William
Pai, Venketeswara
Gaida, Margaret E.
Concepts
Celestial maps; star catalogs
Constellations; zodiac
Volvelle; wheel chart
Astronomy
Instruments, astronomical
Celestial mechanics
Time Periods
Renaissance
Medieval
18th century
Ancient
19th century
16th century
Places
Japan
Middle and Near East
Greece
China
Mesopotamia
India
Institutions
Cologne. Universität
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