Halley, Edmond, 1656-1742, Senex, John, d. 1740, publisher, Burndy Library, donor. DSI · London : Printed for John Senex ... · leaf 18
the Sun in their common Poem, and defcribe equal Areas in equal Times. But now becaufe all Parabolas are fimilar to one another, therefore if any determinate Part of the Area of a gi- ven Parabola, be divided into any Number of Parts at Liberty, there will be a like Divifion made in all Parabolas,… … Let S be the Sun\ POC the Orbit of a Comet, P the Perihelion, O the Place where the Comet is 90 gr. diftant from the Sun, C any other Place. Draw the Right Lines CP, CS, and make ST, SR, equal to CS \ and then having drawn the Right Lines CR, CT, (whereof the one is a Tangent, and the other a…
Comets
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