Astronomicum Caesareum (Astronomy of the Caesars;Шаблон:Sfn also translated as The Emperor's AstronomyШаблон:Sfn) is a book by Petrus Apianus first published in 1540.
Astronomicum was initially published in 1540. Charles V, Holy Roman Emperor, and his brother Ferdinand I, Holy Roman Emperor, both commissioned the work.Шаблон:Sfn It was printed at Apianus's press in Ingolstadt, Bavaria, and took eight years to produce.Шаблон:SfnШаблон:Sfn It expanded and changed when reprinted; the final version has 55 leaves.Шаблон:Sfn 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.Шаблон:Sfn
Although other 16th-century books used volvelles, AstronomicumШаблон:'s are distinctive because they take precedence over the book's text, as opposed to serving as illustrations.Шаблон:Sfn According to Ronald Brashear and Daniel Lewis, Astronomicum is "really a scientific calculating instrument as much as a book".Шаблон:Sfn
A 1997 study reported that 111 copies of the book existed.Шаблон:SfnTycho Brahe bought one copy in 1599 which is in the collection of a library in Gotha, likely Шаблон:Ill.[1]
