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High-school astronomy

Hiram Mattison

ISBN 10: 1236255801 / ISBN 13: 9781236255808
Published by, 2012
Condition: Good Soft cover
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Title: High-school astronomy


Publication Date: 2012

Binding: Paperback

Book Condition: Good

About this title


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. 1872 Excerpt: ... is an eclipse? A solar I Lunar? Cause of solar eclipses? Of lunai i When do lunar eclipses ucke place! (Illustrate the laws ofshadows Y diagram on blackboard.) SHADOWS OF THE PLANETS. Here. also, the lunilnons hody Is the larsrer. anl both preeiselv of the same size as in the rut preewltng; but being placed nearer each other, the shadow is shown to bo considerably shorter. 248. All the planets, both primaries and secondaries, cast shadows in a direction opposite the sun (see the adjoining cir). The t'orin ami leiijjtli of these shadows depend upon the eoniparative magnitude of the sun and planet, and their distance from each other. i the sun and a planet were of the same size, the shadow of the planet would be in the fin-in of a cylinder, whatever its distance. If rue planet were Uiryer than the sun, the shadow would diverge, as we proceed from the planet off into space; and the nearer the sun, the more divergent the shadow would be. w 24S. What said of tlie shadows nf the planets? Of thcir/wm and length t How would it be if toe sun and planet were of tUo same sue? if the planet But as all the-planets are much smaller than the sun, their shadows all converge to a point, and take the form of a cone / and the nearer to the sun, the shorter the shadow. These principles are partly illustrated in the preceding cat The planets nearest the sun have comparatively short shadows, while those more remote extend to a great distance. No primary, however, casts a shadow long enough to reach the next exterior planet. 249. Eclipses of the sun must always happen at New Moon, and those of the moon at Full Moon. The reason of this is, that the moon can never be between us and the sun, to eclipse him, except at the time of her change, or new moon; and slie can never get into ...

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