| Planet | Mean Distance from Sun | Period of Revolution | Velocity in Orbit (Miles per Second) | Eccentricity of Orbit | Inclination of Orbit to Ecliptic | |
| In Miles | Relative to Earth's Distance | |||||
| Mercury | 36,000,000 | 0.39 | 87.97 days | 23 to 35 | .2056 | 7°0' |
| Venus | 67,200,000 | 0.72 | 224.70 days | 21.9 | .0068 | 323 |
| Earth | 92,900,000 | 1.00 | 365.25 days | 18.5 | .0167 | 00 |
| Mars | 141,500,000 | 1.52 | 1.88 years | 15.0 | .0933 | 151 |
| Asteroids[1] | ........... | 2.0-5.2 | ......... | ...... | .00 to .40 | 0° to 35° |
| Jupiter | 483,300,000 | 5.20 | 11.86 years | 8.1 | .0484 | 118 |
| Saturn | 886,000,000 | 9.54 | 29.46 years | 6.0 | .0558 | 229 |
| Uranus | 1,781,900,000 | 19.19 | 84.02 years | 4.2 | .0471 | 046 |
| Neptune | 2,971,600,000 | 30.07 | 164.79 years | 3.4 | .0085 | 147 |
[THE PRINCIPAL ELEMENTS OF THE SOLAR SYSTEM (Continued)]
| Name | Mean Diameter in Miles | Mass | Volume | Density Relative to that of Water | Surface Gravity (Relative to Earth's) | Velocity of Escape (Miles per Second) | Reflecting Power in Per Cent | Period of Axial Rotation | Inclination of Equator to Orbit |
| Relative to Earth's | |||||||||
| Sun | 864,392 | 329,390 | 1,300,000 | 1.40 | 27.64 | 383 | ..... | 25 d. 8 h. | 7°15' |
| Moon | 2,160 | .012 | .02 | 3.34 | 0.16 | 1.5 | 7 | 27 d. 7.7 h. | 641 |
| Mercury | 3,009 | .045 | .06 | 4.48? | 0.31? | 2.2 | 7 | 88 d. ? | ? |
| Venus | 7,575 | .807 | .92 | 4.85? | 0.85 | 6.6 | 59 | ? | ? |
| Earth | 7,918 | 1.000 | 1.00 | 5.53 | 1.00 | 7 | 44 | 23 h. 56 m. | 2327 |
| Mars | 4,216 | .106 | .15 | 3.58 | 0.35 | 1.5 | 15 | 2437 | 2359 |
| Asteroids | 5-485[2] | very small | very small | 3.3 | .0008 to .04 | .33 to .01 | 7 | ..... | ..... |
| Jupiter | 88,392 | 314.50 | 1309 | 1.25 | 2.52 | 37 | 56 | 955± | 3° |
| Saturn | 74,163 | 94.07 | 760 | 0.63 | 1.07 | 22 | 63 | 1014± | 27° |
| Uranus | 30,878 | 14.40 | 65 | 1.44 | 0.99 | 13 | 63 | 1045± | ? |
| Neptune | 32,932 | 16.72 | 85 | 1.09 | 0.87 | 14 | 73 | ? | ? |
TABLE II
THE SATELLITES OF THE SOLAR SYSTEM
| Name | Apparent Magnitude | Mean Distance from Planet's Center, in miles | Diameter in miles | Period of Revolution | Discoverer | Year of Discovery |
| THE EARTH | ||||||
| Moon | 238,857 | 2160 | 27 days, 7 hours, 43 minutes | |||
| MARS | ||||||
| 1. Phobos | 14 | 5,850 | 10? | 0 days, 7 hours, 39 minutes | Asaph Hall | 1877 |
| 2. Deimos | 13 | 14,650 | 10? | 1 day, 6 hours, 17 minutes | Asaph Hall | 1877 |
| JUPITER | ||||||
| v. | 13 | 112,500 | 100? | 0 day, 11 hours, 57 minutes | Barnard | 1892 |
| i. | 6.5 | 261,000 | 2452 | 1 day, 18 hours, 28 minutes | Galileo | 1610 |
| ii. | 6.5 | 415,000 | 2045 | 3 days, 13 hours, 14 minutes | Galileo | 1610 |
| iii. | 6 | 664,000 | 3558 | 7 days, 3 hours, 43 minutes | Galileo | 1610 |
| iv. | 7 | 1,167,000 | 3345 | 16 days, 16 hours, 32 minutes | Galileo | 1610 |
| vi. | 14 | 7,372,000 | small | 266 days, 0 hours, 0 minutes | Perrine | 1904 |
| vii. | 16 | 7,567,900 | very small | 276 days, 16 hours, 5 minutes | Perrine | 1905 |
| viii. | 17 | 15,600,000 | very small | 789 days, 0 hours, 0 minutes | Melotte | 1908 |
| ix. | 19 | 18,900,000 | 20? | 3 years | Nicholson | 1914 |
| SATURN | ||||||
| 1. Meimas | 15 | 117,000 | 600 | 0 days, 22 hours, 37 minutes | Herschel | 1789 |
| 2. Enceladus | 14 | 157,000 | 800 | 1 day, 8 hours, 53 minutes | Herschel | 1789 |
| 3. Tethys | 11 | 186,000 | 1200 | 1 day, 21 hours, 18 minutes | Cassini | 1684 |
| 4. Dione | 11 | 238,000 | 1100 | 2 days, 17 hours, 41 minutes | Cassini | 1684 |
| 5. Rhea | 10 | 332,000 | 1500 | 4 days, 12 hours, 25 minutes | Cassini | 1672 |
| 6. Titan | 9 | 771,000 | 3000 | 15 days, 22 hours, 41 minutes | Huygens | 1655 |
| 7. Hyperion | 16 | 934,000 | 500 | 21 days, 6 hours, 39 minutes | Bond | 1848 |
| 8. Japetus | 11 | 2,225,000 | 2000 | 79 days, 7 hours, 54 minutes | Cassini | 1671 |
| 9. Phoebe | 17 | 8,000,000 | 200? | 546 days, 12 hours, 0 minutes | W.H. Pickering | 1898 |
| 10. Themis | 17 | 906,000 | ? | 20 days, 20 hours, 24 minutes | W.H. Pickering | 1905 |
| URANUS | ||||||
| 1. Ariel | 15 | 120,000 | 500 | 2 days, 12 hours, 29 minutes | Lassell | 1851 |
| 2. Umbriel | 16 | 167,000 | 400 | 4 days, 3 hours, 28 minutes | Lassell | 1851 |
| 3. Titania | 13 | 273,000 | 1000 | 8 days, 16 hours, 56 minutes | Herschel | 1787 |
| 4. Oberon | 14 | 365,000 | 800 | 13 days, 11 hours, 7 minutes | Herschel | 1787 |
| NEPTUNE | ||||||
| 1. Nameless | 13 | 221,500 | 2000 | 5 days, 21 hours, 3 minutes | Lassell | 1846 |
RINGS OF SATURN
| Name | Width, in miles | Distance of Inner Edge from Surface of Saturn, in miles | Distance of Outer Edge from Surface of Saturn, in miles | Diameter of Ring System from outer edge to outer edge, 172,500 miles. Thickness of Ring System, about one hundred miles. Size of Individual Moonlets, probably less than three miles in diameter. |
| Dark or Crape Ring | 10,900 | 5,900 | 16,800 | |
| Bright Ring | 18,000 | 16,800 | 34,800 | |
| Cassini's Division | 2,200 | 34,800 | 37,000 | |
| Outer Ring | 11,000 | 37,000 | 48,000 |