Theoria motuum planetarum et cometarum. Continens methodum facilem ex aliquot observationibus orbitas cum planetarum tum cometarum determinandi. Una cum calculo, quo cometae, qui annis 1680. et 1681. itemque ejus, qui nuper est visus, motus verus investigatur. Berlin, Haude , (1744). 4°. Mit gestochenem Frontispiz, gestochener Titelvignette und 4 gefalteten Kupfertafeln. 187 (recte 186) S. Marmorierter Umschl. d. Zt. (Rckn. mit Fehlst. u. tls. Rd. knickfalt., tls. ger. Eckabr., berieben und bestoßen).

Houzeau-Lancaster 11948. Roller-Goodman 1, 375. Poggendorff 1, 689. Ebert 7065. DSB IV, 467 ff. (Bibliogr. No. 14). Erste Ausgabe. Eulers astronomisches Hauptwerk zusammen mit der "Theoria motus lunae" (1753/1772). "A fundamental work on the calculation of orbits" (DSB). - Die Paginierung springt von 6 auf 9, S. 187 doppelt paginiert. Einige alte Randnotizen u. ausführliche Berechnungen. Durchgehend etwas gebräunt und stellenweise etwas fleckig, etw. gelockert. Breitrandiges, unbeschnittenes Ex. - With engr. frontisp., engraved title vignette and 4 folding copper plates. 187 (recte 186) pp. Contemp. marbled wrappers (back with voids and edges partly creased, partly small torn edges, rubbed and bumped). - First edition of the author's first treatise on astronomy, and of fundamental importance in dynamics. Euler introduced new methods of investigating planetary perturbations; he presumed that the planet was moving, at each instant, in an elliptic orbit whose elements were undergoing slow continuous changes under the action of the disturbing planet. He analyzed these problems by using the observations of the passage of Halley's comet, and then attempted to calculate the rates of change of these elements from the disturbing forces known to be at work. - The pagination jumps from p. 6 to 9, p. 187 twice pag. Some old marginalia and extensive calculations. Continuously some browning, some splotches, a little loose. Uncut copy with very wide margins.

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