An Introduction to Astronomy : Designed As a Text book for the Students of Yale College
The book An Introduction to Astronomy : Designed As a Text book for the Students of Yale College was written by author Denison Olmsted Here you can read free online of An Introduction to Astronomy : Designed As a Text book for the Students of Yale College book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is An Introduction to Astronomy : Designed As a Text book for the Students of Yale College a good or bad book?
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87.) The moon's apparent diameter is 31' 7", and her real diameter 2160 miles. For, Rad. : 238,545 :: sin. 15' 33^" : 1079.6. = moon's semi-diame- ter. (See Fig. 26, p. 71.) And, since spheres are as the cubes of the diameters, the vol- ume of the moon is ^V that of the earth. Her density is nearly I (.615) the density of the earth, and her mass {=z^^x.Qlb) is about sV- 202. The moon shines by reflected light borrowed from the sun, and when full, exhibits a disk of silvery brightness, diversi- ...fied by extensive portions partially shaded. By the aid of the telescope, we see undoubted signs of a varied surface, composed of extensive tracts of level country, and numerous mountains and valleys. 203. The line which separates the enlightened from the dark portions of the moon's disk, is called the Terminator. (See Fig. 2. Frontispiece.) As the terminator traverses the disk from new to full moon, it appears through the telescope exceedingly broken in * Selenography is a word more appropriate to a description of the moon, but is not perhaps sufficiently familiarized by use.
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