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 | 5-4852 | 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 | ? | ? |