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1715, David Gregory, The Elements of Aſtronomy, Physical and Geometrical, volume I, London: J. Nicholson, page 147:
Wherefore a Planet, whoſe Orbit is an Ellipſe, having the Sun for a Focus, muſt neceſſarily be urged, even in its aſcent from the Sun, from the Perihelium to the Aphelium, by a Force tending to the Sun, fince an Ellipſe is concave towards both Foci.