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Astronomy Explained Upon Isaac Newton's Principles and Made Easy to Those who Have Not Studied Mathematics. 2. Ed - Softcover
Synopsis
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1757 edition. Excerpt: ...age upon that plate for every day pointed out by the Sun-hand in the Circle of months; and both Sun and Moon would shew their places in the Ecliptic: for the Sun would go round the Ecliptic in 36 5 Days; and the Moon in 27; days, which _is her periodiml revolution; but from the Sun to the Sun again, or from Change to Change, in 29 days, which is her synodical revolution. 265. If the Earth had no annual motion, the Moon's motion round The Moon's the Earth, and her track in absolute space, would be always the-TZZOF ZZZO' samsie. But as the Earth and Moon move round the Sun, the Moon's diiscribzd. real path in the Heavens is very different from her path round the Earth: the latter being in a progreffive Circle, and the former in a curve of different degrees of concavity, which would always be the same in the same parts of the Heavens, if the Moon performed a compleat number of 'Lunations in a year. 266. Let a 'nail in the end of the axle of a chariot-wheel represent An ideaofthe the Earth, and a pin in the nave the Moon; if the body of the Easffit: Path chariot be propped up so as to keep that wheel from touching the RJOOHJ ground, and the wheel be then turned round by hand, the pin will describe a Circleboth round the nail and in the space it moves through. But if the props be taken away, the horses put to, and the chariot driven over apiece of ground which is-circularly 'convex; the nail in the axle will describe a circular curve, and the pin in the nave will still describe a circle round the progreffive nail in the axle, but not in the space through which it moves. In this case, the curve described by the nail will resemble in miniature as much of the Earth's annual path round the Sun, as it describes whilst the Moon goes as often round...
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