Christophori Clavii bambergensis, ex Societate Iesu
Subtitle: In Sphaeram Ioannis de Sacro Bosco commentarius
Publisher: Apud Victorium Helianum
Published: 1570
Place of publication: Romae
Language: lat
Number of pages: 499
Subjects: Astronomy; Early works to 1800
Other titles: In Sphaeram Ioannis de Sacro Bosco commentarius.
Notes: Known to exist in two issues, with reset first gathering and signature MM (p. 273-280).

As the printer did not have access to letterpress fractions, these were added in ms. throughout the text by a contemporary scribe.

Numerous errors in paging.

Title vignette.

Woodcut illus. (armillary sphere) on t.-p.

Includes the text of Sacro Bosco.

Signatures: [pi]⁴ A-3P⁴ 3Q⁶ [cross]-[2 cross]⁴ (last leaf blank)

Imprint altered in ms. to "M.D.LXXV."

Early book stamps of the Biblioteca Piervissana.

In this issue, the word "CUM" on the title-page ends with an italic "M" and the catchword on the 2d prelim. leaf is "ipsis"; p.273 is misnumbered 279, and the page has 2 ornamental initials, H & P.

In this issue, the word "CUM" on the title-page ends with a roman "M" and the catchword on the 2d prelim. leaf is "generalibus"; p. 273 is correctly numbered and has 1 ornamental initial, an H.

Half-vellum marbled boards.

Rebound in modern vellum-backed paper boards.