HELL, MAXIMILIAN, S.J. Observatio Transitus Veneris ante Discum Solis die 3 Junii Anno 1769. Folding engraved plate (offset). [8], 96 pages. bound between: Ephemerides Astronomicae Anni 1769. Ad Meridianum Vindobonensem. 2 folding plates; 8 (of ?) engraved eclipse tables for the satellites of Jupiter. 244, 42 pages. and: Ephemerides Astronomicae Anni 1770. Ad Meridianum Vindobonensem. Folding engraved plate of the moon; 8 (of ?) engraved eclipse tables for the satellites of Jupiter. 244; [2], 66 pages. 3 volumes in one * Ephemerides Astronomicae Anni 1783. Ad Meridianum Vindobonensem. 8 (of ?) engraved eclipse tables for the satellites of Jupiter; folding engraved plate of the moon. 269, [1]; 128 pages. Together, 4 works in 2 volumes. 8vo, 198x122 mm, contemporary vellum boards with spine title in ink, and 201x122 mm, contemporary calf gilt with superficial vertical crack in spine; contents of the first volume toned, piece of paper pasted over page of woodcuts in the 1783 Ephemerides depicting the phases of Venus. 19th-century bookplate of Richard H[inckley?] Allen in the first volume; bookplate of the astrologer Erich von Beckerath (1891-1981) in the second. Vienna: Johann Thomas von Trattner, 1770; 1769; 1769; 1782