This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1891 Excerpt: ...shows plainly in the position of the sun. 224. Inclination of the Orbits.--The orbits are drawn as if they all lay on the plane of the ecliptic; i.e., on the surface of the paper. This is not quite correct. The orbit of the asteroid Pallas should be really tipped up at an angle of nearly 30, and that of Mercury, which ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1891 Excerpt: ...shows plainly in the position of the sun. 224. Inclination of the Orbits.--The orbits are drawn as if they all lay on the plane of the ecliptic; i.e., on the surface of the paper. This is not quite correct. The orbit of the asteroid Pallas should be really tipped up at an angle of nearly 30, and that of Mercury, which is more inclined to the ecliptic than the orbit of any other of the principal planets, is sloped at an angle of 7. The inclinations, however, are so small (excepting the asteroids)-f0a--g=--r that they may be neg /f?8 j? _--y lected for ordinary pur B-7--., --Wr:1"y--T4 poses. On the scale of-Hcl"1" __, %fSs the diagram, Neptune, which rises and falls the most of all with reference to the plane of the ecliptic, would never be more than a third of an inch above or below the level of the paper. The line in which the plane of a planet's orbit cuts the plane of the earth's orbit at the ecliptic is called the Line of Nodes. Fig. 44 shows how the line of nodes and the inclination of the two orbits are related. 225. Geocentric Motions of the Planets; i.e., their motions with respect to the earth regarded as the centre of observation. While the planets revolve regularly in nearly circular orbits around the sun, with velocities' which depend upon their distance from it, the motions relative to the earth are very different, being made up of the planet's real motion combined 1A planet's velocity in miles per second equals very nearly.--. vDistance 9n Fig. 44.--Inclination and Line of Nodes. with the apparent motion due to that of the earth in her own orbit. If, for instance, we keep up observations, for a long time, of the direction of Jupiter as seen from the earth, at the same time watching the changes of its distance by measuring the alte...
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