Astronomicum Caesareum

[2] Apianus evidently changed his plans while producing a single edition.

A volvelle in one version of Astronomicum has "an entirely irrelevant base of an astrolabe" underneath, suggesting that he considered creating one and then abandoned the idea.

[5] However, despite the false science on which they depended, knowledgeable readers could still use them to predict planetary movements.

[5] Nicolaus Copernicus published De revolutionibus orbium coelestium shortly after Astronomicum appeared, which began a transition to heliocentrism as the standard astronomical model.

[4] According to Ronald Brashear and Daniel Lewis, Astronomicum is "really a scientific calculating instrument as much as a book".