A commentary on Centiloquium v. 51 written before 1506, on which date it was copied by Johannes Schöner in what is now MS Vienna, ÖNB, 5503. In both extant manuscripts, it is attributed to Giovanni Pontano, but this attribution is unlikely, as the text is wholly different from Pontano’s commentary (see C.3.16). On the other hand, it is related to Albertus de Brudzewo’s (?) Circulum pro exitu geniture ab utero iuxta verbum Ptolomei 51 rectificare (C.3.17), with which it shares several phrases. In MS Vienna, ÖNB, 5503, the text is followed by four tables on the duration of pregnancy (‘Tabula more infantis in utero matris. Mora occidentalis, Luna super terram’, ‘Tabula more infantis in utero matris. Mora orientalis, Luna infra terram’, ‘Tabula mediorum motuum infra tempus more’ and ‘Tabula mediorum motuum in horis et minutis hore infra tempus more’). These tables, which are explicitly referred to in the text, are attributed to Giovanni Bianchini in notes added by Schöner in the upper margin of f. 111r-114r, and similar tables are indeed found in the second edition of Bianchini’s Tabulae astronomicae (ed. Venice, 1526, Luceantonius Junta [EDIT16: CNCE 5742], sig. 394v-397v), where they are attributed to Jacobus de Dondis of Padua (d. 1359). Bianchini’s tables, however, offer different values, so that the tables of the present commentary probably derive from another source. The pregnancy tables are commonly found in fifteenth- and sixteenth-century manuscripts.

Text ‘(Vienna, ÖNB, 5503) Ioviani Pontani expositio in verbum 51 Centiloquii Ptholomei. Circulum geniture in exitu nati ab utero secundum verbum 51 sic extrahitur. Primum ad tempus datum inveniatur locus Solis cum quo erigatur celi figura ad quam imponatur locus Lune verus — maxime ubi Luna dignitatem ilechyam vendicaverit sibi. Τελóσ’ (followed by tables f. 111r-114v).

Bibl. None. On the pregnancy tables, see J. Chabás, B. R. Goldstein, The Astronomical Tables of Giovanni Bianchini, Leiden-Boston, 2009, 129-132; and J. Chabás, B. R. Goldstein, A Survey of European Astronomical Tables in the Late Middle Ages, Leiden-Boston, 2012, 223-226.

Modern ed. ---