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 24
are likewife Comets; andthefe, if they are lafting in their Nature andMotions, move in very excentric Orbits, and£onfequently fhew themfelves only, when theyare in thofe Parts of their Orbits that areneaTeftto us and the Sun: Some of themdiove, like thePlanets, from Weft to Eaft, others from Earft… … Book I. of AsTRqi^QU ¥• j ijie Orbits of the Planets. Their Periods arenot as yet known from ObferVation, nor in-deed is it fully certain^ that tl^ey move in Linesthat return into themfelves. But ail thefe thingis^^perhaps^ will be determined by proper Obfer-vations made in future Ages. The reft of…
Astronomy
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