Tabulae directionum profectionumque, non tam astrologiae iudiciariae, quam tabulis instrumentisque innumeris fabricandis utiles ac necessariae [...]. Eiusdem Regiomontani Tabula sinuum per singula minuta extensa, universam sphaericorum triangulorum scientiam conplectens.

4to: [5]-156-[1] ff. (quire a bound in wrong order; some toning, spotting or dampstaining, title soiled, fore-edge top corner stained, wormtrack in final quire).

16th-c. limp vellum, flat spine with paper label (stained, fore-edge top corner of covers def., 2 holes in front cover). Good copy.

Repr. of the 1550 Tübingen ed. of these notable tables, completed by Regiomontanus (1436-1476) in Hungary in 1467 while serving as professor of mathematics at the newly-founded University of Pressburg (Bratislava) in Hungary. They were based upon both computation and the abundant observations made by him in Italy during the preceding years. “In 1467, with Bylica’s assistance, Regiomontanus computed his Tables of Directions, which consisted of the longitudes of the celestial bodies in relation to the apparent daily rotation of the heavens. These Tables [were] computed for observers as far north of the equator as 60 degrees; in Tables of Directions he included a table of tangents (although he did not use this term) for angles up to 90 degrees, thereby providing the model for our modern tables.” (D.S.B. XI:350). The work is an important contribution to the history of trigonometry. Latin poem by Ph. Melanchthon on verso of title. On title woodcut diagram with the author’s horoscope. Ref. VD-16 M-6559. - Adams R-290. - Houzeau-Lancaster 2257. - STC German (BL) 632. - Zinner 2225. Prov. Unidentified collector’s stamp on title and f. 48r H. Silvaj (or H. Schraj ?). - Bookpl. with initials H.S.