Astrnomical observations.
Snellius van Roijea, Willebrordus, editor, 1591-1620. **E5117.45
Coeli & siderum in eo errantium observationes Hassiace, illustris-
simi principis Wilhelmi Hassiz, Lantgravii auspicijs quondam
institutae. Et spicilegium biennale ex observationibvs Bohemicis
v. n. Tychonis Brahe. Nunc primum publicante Willebrordo
Snellio. Quibus accesserunt, Ioannis Regiomontani & Bernardi Walteri observationes Noribergicz.
— Lwvgdvni Batavorvm. Apud Iustvm Colstervm, anno CID ID C-
XVIII. (12), 116 pp. 68 ff. Diagrams. Tables. 18% cm., in 4s.
This card was printed at the Boston Public Library, May 21, 1921. Mrs508 — Astronomical observa tions. — William IV., Landgrave of Hesse Cassel. — Brahe, Tycho, 1540-1601. — Mueller, Johannes Regiomon-
tanus, 1436-1476. — Walther, Bernardus, 1430-1504.