EULER, LEONHARD - GRAVITATIONAL ASTRONOMY.

Recherches sur la Précession des Équinoxes, et sur la Nutation de L'Axe de la Terre (and) De la Parallaxe de la Lune tant par Rapport a sa Hauteur qu'a son Azimuth dans L'Hypothese de la Terre Spheroidique.

(Berlin, Haude et Spener, 1751). 4to. No wrappers, as issued in "Mémoires de l'Academie Royale des Sciences et Belles-Lettres", Tome V, pp. 289-325 and 1 folded engraved plate - pp. 326-338 and 1 folded engraved plate.

Both first edition.These memoirs "Research concerning the precession of the eqinoxes and of the nutation of the earth's axis" and "On the parallaxe of the Moon, with respect to its elevation and azimuth, under the hypothesis of a spherical earth" played an importent role in the confirmation of Newton's theory of gravitation by using analytical methods instead of geometrical. - Eneström, Euler Bibliography E 171 a. E 172.

Order-nr.: 36102