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. 1850 Excerpt: ... these will be the points y and =0=, of which the former is the eastern and the latter the western point of the ecliptic. The latitude of any point a of the heavens is the arc, a K, of a great circle, n tk, of the heavens passing through a and through the pole rr, and its longitude the arc y N w s K of the celestial ...
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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. 1850 Excerpt: ... these will be the points y and =0=, of which the former is the eastern and the latter the western point of the ecliptic. The latitude of any point a of the heavens is the arc, a K, of a great circle, n tk, of the heavens passing through a and through the pole rr, and its longitude the arc y N w s K of the celestial ecliptic. The sphere of the heavens which we are now describing is in reality a different one from that before spoken of; that sphere had its imaginary centre in the centre of the earth; this has for its centre the centre of the sun; so that the centre of its former sphere was in motion, and its motion was perpetually round the centre of this sphere. But it was shown that the radius of the circle in which this motion takes place is infinitely small as compared with the radius of the great sphere of the heavens; so that, so far as the appearance of objects on its surface was concerned, it might be considered to be at rest. So far as the appearance of these objects is concerned, it may therefore be supposed to coincide with the centre of that sphere of which we are now speaking. Considering, then, the centres and surfaces of these spheres to coincide, we shall have two sets of lines on the celestial sphere, the one having reference to the equinoctial, and the other to the ecliptic, and two poles, one being that of the former, and the other of the latter. The right ascension and declination of any heavenly body or point in the heavens is measured and fixed by means of the former set of lines, precisely as its longitude and latitude are by means of the latter. XXVII. The Earth's Path In Space Is Continually Changing. It is a source of great perplexity in astronomy, that none of those systems of lines which are imagined to be described in space, and ...
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Add this copy of Lectures on Astronomy, Delivered at King's College, to cart. $73.99, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2019 by Wentworth Press.
