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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