Title page vignette (arms of the dedicatee, Luys Faxardo, marques de los Velez y de Molina).
Second leaf is an allegorical engraving captioned Astronomia.
Text within double line border.
The preliminary matter includes license, 3 leaf royal privilege and aprouacian, a sonnet by Lope de Vega Carpio, one in Italian by Licenciado Camarino, "Hieronymi Ramiri in laudem autoris epigramma," "Camarini poligraphi in laudem authoris encomastichon," 4 leaf dedication, and 3 leaf table of contents.
Full page woodcut of astronomical instrument on verso of fifteenth leaf; portrait of author on verso of the sixteenth leaf.
Erratas: verso of leaf [3].
Sphera de Iuan de Sacrobosco: leaves [230]-[272].
Bookplates: Joaquin Garcia Icazbalceta; José M. Rodriguez; Harrison D. Horblit.