Astronomicum Caesareum

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Cover page of the 1540 edition
Cover page of the 1540 edition

Astronomicum Caesareum (Astronomy of the Caesars;[1] also translated as The Emperor's Astronomy[2]) is a book by Petrus Apianus first published in 1540.

Astronomicum was initially published in 1540. Charles V, Holy Roman Emperor, and Ferdinand II of Aragon commissioned the work.[3] It was printed at Apianus's press in Ingolstadt, Bavaria, and took eight years to produce.[4][5] It expanded and changed when reprinted; the final version has 55 leaves.[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.[6]

Twenty-one of its 36 woodcuts are volvelles.[1] Astronomicum's volvelles rely on a geocentric model of the universe.[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.[2]

Although other 16th-century books used volvelles, Astronomicum's are distinctive because they take precedence over the book's text, as opposed to serving as illustrations.[4] According to Ronald Brashear and Daniel Lewis, Astronomicum is "really a scientific calculating instrument as much as a book".[5]

A 1997 study reported that 111 copies of the book existed.[7] Tycho Brahe bought one copy in 1599 which is in the collection of a library in Gotha, likely  [de].[8]

Notes[]

  1. ^ a b Helfand 2002, pp. 20–21.
  2. ^ a b c Christianson 2012, p. 83.
  3. ^ Helfand 2002, p. 20.
  4. ^ a b Helfand 2002, p. 81.
  5. ^ a b c d Brashear & Lewis 2001, p. 8.
  6. ^ Gingerich 1994, p. 294.
  7. ^ Brashear & Lewis 2001, p. 81.
  8. ^ Price, Derek J. de Solla (6 October 1967). "The Book as a Scientific Instrument". Science. 158 (3797): 102–104. ISSN 0036-8075. JSTOR 1722376.

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