Tractatus de spera d[e] Ioha[nn]is de sac[ro] busco. Theorica planetaru[m].1467.latManuscript on paper, in two different hands, containing Joannes de Sacro Bosco's De sphaera mundi and Additiones (1r-22v) and Gherardo da Cremona's Theorica planetarum (23r-38v). First hand is unidentified; second hand, Jacobus de Milisapris, has copied the Theorica planetarum. Also includes a number of astronomical illustrations; in De sphaera mundi: f. 1v ("de forma mundi notatur hec spera"); in Theorica planetarum: ff. 23v, 26r-v, 29r, 33r, 34r. Manuscript is a palimsest; original text is a 15th-century Italian religious textIn Latin.Titles from opening rubrics.Script: first hand writes in humanist minuscule; second hand in gothic textualis.Decoration: headings in red. Rubrication.Layout: 1 column of 30 lines.Binding: seventeenth-century paper binding over paper boards.Foliation added in red modern pencil.Scribal note (f. 38v): Explicit Theorica planeta[rum] per me Iacobu[m] de Milisapris de Portuna[v]o[n]is. Anno C[hrist]i optimi 1467 die nono me[n]sis septembris hora m[er]curii. In paduano studio i[n] [con]trata colombino[rum].