The Elements of Astronomy Designed for the Use of Students in the University

The book The Elements of Astronomy Designed for the Use of Students in the University was written by author Samuel Vince Here you can read free online of The Elements of Astronomy Designed for the Use of Students in the University book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Elements of Astronomy Designed for the Use of Students in the University a good or bad book?

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M. De la Lande makes it 57 X . 5" at the equator, 56'. 53", 2 at the ON PARALLAX.
77 pole, and 57'. L" for the mean radius of the earth, sup- posing the difference of the equatorial and polar diameters to be of the whole. From the formula 30O of Mayer, the equatorial parallax is 57'- ll", 4.
(146. ) To find the mean distance, Cs, of the moon, we have AC, the mean radius (r) of the earth, : Cs, the mean distance (Z)) of the moon from the earth, :: sin. 57'. L" = AsC (145) : radius :: 1 : 6o, 3 ;... conse- quently Z>~6o, 3r ; but r = 396*4 miles ; hence, Z) = 239029 miles.
(147. ) According to M. De la Lande, the horizontal semidiameter of the moon : it's horizontal parallax for the mean radius (r) of the earth :: 15' : 54'. 57", 4, or very nearly as 3 : 1 1 ; hence, the semidiameter of the moon is TT r = -rrx 3964 = 1081 miles; and as the magnitude of spherical bodies are as the cubes of their radii, we have the magnitudes of the moon and earth as 3 3 : II 3, or as I : 49 nearly.
CHAP. VIL ON REFRACTION.

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