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 302
ot thecentre of the earth that describes the annual orbitround the sun, but the common centre * of gravityof the earth and moon together, and that, whilst theearth is moving round the sun, it also describes acircle round that centre of gravity, going as manytimes round it in one revolution about… … centre of gravity. Let M be the moon, T W partof the moons orbit, and C the centre of gravity ofthe earth and moon. Whilst the moon goes roundher orbit, the centre of the earth describes thecircle g ed round C. To this circle g ak is atangent; and therefore, when the moon has gonefrom M to a point…
Astronomy
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