The wonders of the heavens, being a popular view of astronomy, including a full illustration of the mechanism of the heavens; embracing the sun, moon, and stars, with descriptions of the planets, comets, fixed stars, double stars, the constellations, the galaxy, or milky-way, the zodiacal light, aurora borealis, or norhtern lights, meteors, clouds, falling stars, aërolites, &c (1837)
Bradford, Duncan. [from old catalog] · Boston, American stationers company · leaf 331
arth. But the true quantity of the moons horizontalparallax cannot be accurately determined by thismethod, on account of the varying declination ofthat body, and the perpetual changes in the stateof the atmosphere. Astronomers have thereforethought of the following method, which is free fromthose… … other that the one at A sees the moon M in hishorizon whilst the other at B sees it in his zenith.Now the angle at 0 is equal to the difference oflatitude of the two observers, the angle A is ninetydegrees, and the side A 0 is the semidiameter ofthe earth. These three things being given in…
Astronomy
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