Lewis & Short

astrŏonŏmĭa, ae, f., = ἀστρονομία, knowledge of the stars, astronomy (for the earlier astrologia, q. v.), Sen. Ep. 95; Petr. 88, 7; Macr. Somn. Scip. 2, 4; Aug. Civ. Dei, 18, 39.