Essays on several curious and useful subjects, in speculative and mix'd mathematicks : illustrated by a variety of examples (1740)
Simpson, Thomas, 1710-1761, Adams, John, 1735-1826, former owner. BRL, John Adams Library (Boston Public Library) BRL · London : Printed by H. Woodfall, jun. for J. Nourse ... · leaf 220
enfity be the the fame, are fimply as the Tangents of their Zenith Diftances.But now to eftimate in fome fort, how near this Proportioncomes to Truth, and how far it may be relied on j let any twoconvenient Altitudes, i. e. that are neither very fmall norvery near each other be alfumed. Suppofe one… … fity at A. Now the Height of this Surface above A E, the Sur-face of the Earth, from the known Properties of Air, and Ex-periment made on the Tops of very high Hills, cannot be more than about c Miles, or ^ of the Earths Radius* Therefore we have, as 1 -h ^ (O-w;) : i (AO) : : the Cofineof (RAE =…
Celestial mechanics · Calculus · Astronomy
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