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Title: Untersuchungen uebfr [sic!] veraenderliche Eigenbewegungen. Ersther Theil. Bestimmung der Elemente der Procyonbahn und Untersuchung der fuer veraenderlich gehaltenen Eigenbewegungen von a Virginis, B Orionis und a Hydrae. Nebst einem die Reduction eines Theils der Beobachtungen an den Mittagsfernroehren von Greenwich und Palermo von 1765 bis 1810 enthaltenden Anhang. Inaugural Dissertation... AND: IDEM, Untersuchungen ... Zweiter Theil. Bestimmung der Elemente der Siriusbahn.
Description: Koenigsberg, Druck der Universitäts-Buch-und Steindruckerei von E.J. Dalkowski, 1862. and Leipzig, Engelmann, 1868. 2 vols. 4to. The 1862 vol. in contemp. hlf. blue green cloth, over marbled brds., spine giltlettered. [n2, 1-12 in 4s]. (IV, 96 pp.).(Thesis). The second part [published in the series 'Publication der Astronomischen Gesellschaft. VII'] in original printed wrappers. [n3, 1-20 in 4s.]. (VI, 158, II [errata and impressum] pp.). (Uncut, unopened.). [2nd part ex bibliotheca Sternwart Leipzig, de accessioned / doublette]. Auwers dissertation. Rare. DSB I, 339: 'He made a great number of observations and calculations of planets, comets, and variable stars as early as 1857-1859, his first year at Göttingen University. ... He made heliometric observations of double stars, which led him to his dissertation 'Untersuchingen über veränderliche Eigenbewegungen (1862( [Here offered]. Bessel's assumption that certyain changes in the proper motions of the starts Sirius and Procyon are based on the presence of invisible companion stars had opened a new field in celestial mechanics. Auwers was able to derive the orbits for both Sirius and Procyon as weakly eccentric elipses, corresponding to the motion of of the visible principle stars around the center of graviuty of the double star system in forty or fifty years, respectively. A few years later it became possible also to observe theur very faint companions by optical means.... Auwers'lifework was the meticulous observation and calculation necessary to draw up star catalogs with highly accurate positions of the stars. ': NDB vol. I, p. 462: A second publication followed in 1868, Leipzig, which we add here in excellent original printed wrappers.

Keywords: astrophysics history astronomy telescopes

Price: EUR 650.00 = appr. US$ 706.45 Seller: Antiquariaat B.M.Israel B.V.
- Book number: 7834