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 406
regard of the Ecliptic. And in the oneObfervation let Z 5 L be a Vertical Circle, inwhich Z is the Zenith, and /g the apparentplace of the Phaenomenon; in the other, letX.BL be a Vertical, X the Zenith, C for theVertical point may be confidered as moved inregard of the Ecliptic unmoved, as well as…
Astronomy
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