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 18
true Place of the Star,from the Earth, will be in the Diredion rf and with Ref-pea to the Ecliptick, in the Line r e -, therefore the Angle^re { = C^Sr) being the Difference of Longitudes of theSun and Star, is given by the Queftion. Let rg, the Sine ofthe Supplement of this Angle, be denoted by b… … (6) its Orbit from r to p, over a Diftance fignified by r; and,p e, pf being drawn, make r n and nm perpendicular there-to : Then becaufe of the exceeding Smallnefs of/> r it may beconfidered as a Right-Line; and we fhall have i (Sr):^[rg):: r (pr):rb{= p n) ; and i : ^ :: c : r c(= r «) (by…
Celestial mechanics · Calculus · Astronomy
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