APPENDIX. ASTRONOMICAL QUANTITIES. |
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 in
Millions of Miles. | Periodic Time
in Days. | Mean
Diameter
in Miles. | Axial Rotation. | Density
compared
with
Water. | | 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 Centre
of Mars. | Periodic Time. | | | hrs. | mins. | secs. | | Phobos | 5,800 miles | 7 | 39 | 14 | | Deimos | 14,500 miles | 30 | 17 | 54 |
The Satellites of Jupiter.
| Mean Distance from Centre
of 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 Centre
of 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 Centre
of 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 Centre
of Neptune. | Periodic Time. | | | days. | hrs. | mins. | secs. | | Satellite | 220,000 miles | 5 | 21 | 2 | 44 |
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