“Experimentarius”

De modo collegiandi, pronosticandi, et curandi febres, nec non de humana felicitate ac denique de fluxu maris lucubrationes

Federicus Chrysogonus' astronomical volvelle was used to predict tides by setting the position of the sun and the moon.

Astronomicum Caesareum

Among the variety of pages with moving parts comes first and foremost a set of planetary equatoria, paper wheels for finding the places of the planets within the zodiac. Embodying all the details of the geocentric Ptolemaic system, the volvelles and threaded charts provide a remarkably accurate graphical calculation of a planet's position.