(BERNOULLI, JEAN (JOHANN) & BERNOULLI, DANIEL. - THE MECHANICS OF THE HEAVENS.

Essai d'une nouvelle Physique celeste. Servant à expliquer les principaux Phenomenes du Ciel, & en particulier la cause physique de l'inclinaison des Orbites des Planetes par rapport au plan de l'Equateur du Soleil. Qui a partagé le Prix double de l'année 1734.(+ Daniel Bernoulli:) Recherches Physiques et Astronomiques sur la Probleme propose pour la seconde Fois Par l'Academie Royale des Sciences de Paris. Quelle est la Cause physique de l'inclibnaison des Plans de des Orbites des Planetes par rapport....Qui a partagé double de l'année 1734..... (+ Daniel Bernoulli:) Disquisitiones Physico-Astronomicae problematis ab inclyta scientarium Academia Regia iterum propositi. Quellle est la Cause physique de l'inclinaison des plans des Orbites des Planetes...sive Quaenam est Causa physica inclinationis planorum, in quibus Planetae Orbitas suas perficiunt ad plllanum Aequatoris, vertigini Solis circa axem suum respondentis;...(Pieces qui ont remporte le prix Double de L'Academie Royale des Sciences, En M. DCCXXXIV.

Paris, Imprimerie Royale, 1735. 4to. Fine recent marbled boards. Printed titlelabel on frontcover. (6),144 pp. and 1 double-page folded engraved plate. Johann B's paper: pp. (1-) 91. - Daniel B's papers: pp. (93-) 122 and pp. 123-144. A few marginal brownspots.

First edition of these prize winning papers by father (Jean) and son (Daniel). - Both papers deals with the cause of the inclination of the planetary orbits relative to the solar equator. - In Daniel's paper he put foreward the hypothesis of the existence of an atmosphere, resempling air, and rotating around the solar axis, resulting in an increasing inclination of the planetary orbits toward the equator of the sun. Daniel was the first importent Newtonian outside Great Britain. The problems faced here (by Daniel) are treated in Newtonian manner.
The publication of these papers by father and son resulted in a controversy between the two, forcing Daniel to leave his fathers house. - Poggendorff I:161.

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