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The elements of astronomy, physical and geometrical (1715)

Gregory, David, 1659-1708, Halley, Edmond, 1656-1742. Synopsis of the astronomy of comets, Adams, John, 1735-1826, former owner. BRL, Boston Public Library (John Adams Library) BRL · London : Printed for J. Nicholson ... and sold by J. Morphew ... · leaf 157

An illustration from The elements of astronomy, physical and geometrical, 1715, leaf 157
e attra-ctions as the Planets ^ Mercury,(by ?rop,^o.) willdefcribe very nearly an Ellipfe having theFocusin the Center of the Sun;Venus,anEllipfe whofeFocus is in the common Center of Gravityof the Sun and Mercury, and fo ©n , each pri-mary Planet will defcribe an Ellipfe, whofe Fo-cus is in the… … Book I. (?/ A s T R o N o M Y. 117 Section IX. Of the Motion of a Syftem of Bodies,which revolves about another Body 5 allwhich is applied to the Syftem of theSun and Planets Primary and Secondary. Proposition LIX. THE common Center of Gratuity of a Sjfiem oftwo or more heavy Bodiesy revolving…

Astronomy

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