A Short Course in Astronomy And the Use of the Globes
A Short Course in Astronomy And the Use of the Globes
Henry Kiddle
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They therefore make only a very small angle with the plane of its orbit (about 3°). 132. Their distances from Jupiter are, respectively, 264,000 miles, 423,000 miles, 678,000 miles, and 1,188,000 miles. Their diameters in approximate numbers are I., 2,300 miles; 11., 2,070 miles; III., 3,400 miles; IV., 2,900 miles ; all, excepting the second, being larger than the moon. As seen from Jnpiter these bodies present quite large disks ; the apparent diameter of L being 36' ; oi II., 19' ; of III., 1...8' ; and of lY., 9'. The first ia tlierefore somewhat larger in appearance than that of the moon. The firmament of Jnpiter must present a very beautiful diversity of phenomena. These various moons, all of which are occasionally above the horizon at one time, go through their phases within a few days ; the first within 42 hours. To an inhabitant of the first satellite, the apparent diameter of Jupiter must be 19° ; that is, about 36 times as great as the moon ; while the amount of illuminated surface presented by it must be nearly 1300 times as great.
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