Joannis de Sacrobusto, A[n]glici, uiri clarissimi, Spera mundi
By: [Gerardi Cremonensis, uiri clarissimi, Theorica planeta[rum] feliciter incipit. Tractatus de motu octaue sp[her]e]
Contributors: Gherardo, da Cremona, 1113 or 1114-1187; Gherardo, da Sabbioneta, active 13th century; Incunabula Collection (Library of Congress); John Boyd Thacher Collection (Library of Congress)
Publisher: P[er] ... Dominicu[m] Fuscum Ariminensem
Published: 1480
Place of publication: Imp[re]ssa Bononiae
Language: lat
Number of pages: 80
Subjects: Early works to 1800; Planetary theory; Spherical astronomy
Other titles: Tractatus de motu octavae sphaerae. 1480.; Spera mundi.; Theorica planetarum.; Tractatus de motu octaue sphere.
Work titles: Sphaera mundi
Notes: Titles from p. [1], [41], and [73].

The Theorica planetarum is usually considered to be by the Cremona astrologer Gherardo da Sabbioneta, although some authorities ascribe it to the Gerardus Cremonensis who died 1187. Cf. Dict. of scientific biog., suppl., p. 189 for a summary of the evidence.

"Reprinted from the edition of Renner, Venice 1478 ... with the addition of the tract De motu octauae spherae. The diagrams are rough copies of Renner's"--BM 15th cent.

Imprint from colophon to the Theorica planetarum.

Signatures: [1-2⁶ 3-4⁴ 5-6⁸ 7⁴].

LC copy: pages [55-64] misbound following p. [42]. Rebound in vellum (early musical ms.) over boards. Bookplate of Hans Rosenberg.

Goff J-404

BM 15th cent., VI, p. 820 (IA.28693)

Hain-Copinger 14109

IGI 5342

Thacher 546