Page 274 SOME ELEMENTS OF THE SOLAR SYSTEM

Name. Sign. Masses. Mean Dist. from Sun. Mean Diameter in Miles. Density. = 1. Axial Revolu­tion. Gravity at Surface. = 1. Periodic Time. Orbital Velocity in Miles per sec.

Earth's Dist. as 1. Millions of Miles.

Sun Unity 860,000 0.255 25 to 26d 27.71

Mercury 1/5000000(?) 0.387 35-3/4 2,992 1.21 24h 5m(?) 0.46 87.97d 29.55

Venus 1/425000 0.723 66-3/4 7,660 0.85 23h 21m(?) 0.82 224.70d 21.61

Earth 1/326800 1. 92-1/3 7,918 1. 23h 56m 4s 1. 365.26d 18.38

Mars 1/2950000 1.523 141 4,211 0.737 24h 37m 22.7s 0.39 686.98d 14.99

Asteroids (No.)

Jupiter 1/1047 5.203 480 86,000 0.243 9h 55m 20s 2.64 11.86yrs 8.06

Saturn 1/3501 9.538 881 70,500 0.133 10h 14m 1.18 29.46yrs 5.95

Uranus 1/22600 19.183 1771 31,700 0.226 Unknown. 0.90 84.02yrs 4.20

Neptune 1/19380 30.054 2775 34,500 0.204 Unknown. 0.89 164.78yrs 3.36