Project Gutenberg #27378
The Story of the Heavens
Robert S. Ball
1885Ball's illustrated popular survey of astronomy, prepared chapter by chapter from Project Gutenberg HTML.
Project Gutenberg #27378 Public domain in the United States Cover source Local typographic cover created for MojiMori from public-domain source metadata
Section 28 of 28
ASTRONOMICAL QUANTITIES.
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The Sun.
The sun's mean distance from the earth is 92,900,000 miles; his diameter is 866,000 miles; his mean density, as compared with water, is 1·4; his ellipticity is insensible; he rotates on his axis in a period between 25 and 26 days.
The Moon.
The moon's mean distance from the earth is 239,000 miles. The diameter of the moon is 2,160 miles; and her mean density, as compared with water, is 3·5. The time of a revolution around the earth is 27·322 days.
The Planets.
Distance from the Sun inMillions of Miles. Periodic Timein Days. MeanDiameterin Miles. Axial Rotation. DensitycomparedwithWater. Mean. Least. Greatest. Mercury 36·0 28·6 43·3 87·969 3,030 (?) 6·85(?) Venus 67·2 66·6 67·5 224·70 7,700 (?) 4·85 Earth 92·9 91·1 94·6 365·26 7,918 23 56 4·09 5·58 Mars 141 128 155 686·98 4,230 24 37 22·7 4·01 Jupiter 483 459 505 4,332·6 86,500 9 55 — 1·38 Saturn 886 834 936 10,759 71,000 10 14 — 0·72 Uranus 1,782 1,700 1,860 30,687 31,900 Unknown 1·22 Neptune 2,792 2,760 2,810 60,127 34,800 Unknown 1·11
The Satellites of Mars.
Mean Distance from Centreof Mars. Periodic Time. hrs. mins. secs. Phobos 5,800 miles 7 39 14 Deimos 14,500 miles 30 17 54
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The Satellites of Jupiter.
Mean Distance from Centreof Jupiter. Periodic Time. days. hrs. mins. secs. New Inner Sattellite Barnard 112,500 miles 0 11 57 22 I. 261,000 miles 1 18 27 34 II. 415,000 miles 3 13 13 42 III. 664,000 miles 7 3 42 33 IV. 1,167,000 miles 16 16 32 11
The Satellites of Saturn.
Mean Distance from Centreof Saturn. Periodic Time. days. hrs. mins. secs. Mimas 115,000 miles 0 22 37 6 Enceladus 148,000 miles 1 8 53 7 Tethys 183,000 miles 1 21 18 26 Dione 235,000 miles 2 17 41 9 Rhea 329,000 miles 4 12 25 12 Titan 760,000 miles 15 22 41 27 Hyperion 921,000 miles 21 6 38 31 Iapetus 2,215,000 miles 79 7 56 40
The Satellites of Uranus.
Mean Distance from Centreof Uranus. Periodic Time. days. hrs. mins. secs. Ariel 119,000 miles 2 12 29 21 Umbriel 166,000 miles 4 3 27 37 Titania 272,000 miles 8 16 56 30 Oberon 364,000 miles 13 11 7 6
The Satellite of Neptune.
Mean Distance from Centreof Neptune. Periodic Time. days. hrs. mins. secs. Satellite 220,000 miles 5 21 2 44
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