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SYNOPTICAL TABLES.
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| Mer. | Ven. | Earth. | Mars. | Ast. | Jup. | Sat. | Uran. | Nep. | |
| Distance from Mercury, | 0 | 3 | 6 | 12 | 24 | 48 | 96 | 192 | 384 |
| 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | |
| — | — | — | — | — | — | —— | —— | —— | |
| Distance from Sun, | 4 | 7 | 10 | 16 | 28 | 52 | 100 | 196 | 388 |
| Actual distances. | 3.9 | 7.3 | 10 | 15.2 | 27.4 | 52 | 95.4 | 192 | 300 |
| Average density of planets exterior to asteroids (water =1), | 1.07 |
| Average density of interior planets, | 5.33 |
| Proportion of average diameter of interior planets to that of exterior, | 1-10th |
| Average rotation of exterior planets, in hours, nearly | 10 |
| Average rotation of interior planets, nearly | 24 |
| Number of satellites of exterior planets, | 18 |
| Number of satellites of |interior planets, | 1 |
KIRKWOOD'S LAW.
The square of the number of times that each planet rotates during one revolution in its orbit is proportional to the cube of the diameter of its sphere of attraction.
The sphere of attraction is that within which the attraction of one planet is greater than that of the next interior or exterior planet.
| Name of Body. | Volume. | Density. | Light and Heat. | Gravity. | Time of Rotation. | Distance from Sun. | |
| h. | m. | ||||||
| Sun | 1415225 | .250 | ... | 28.36 | 607 | 48 | ... |
| Vulcan | .0035 | ... | 30.32 | ... | ... | .19 | |
| Mercury | .0595 | 1.225 | 7.58 | 0.48 | 24 | 6 | .39 |
| Venus | .9960 | .908 | 1.91 | 0.9 | 23 | 21 | .73 |
| Earth | 1.0 | 1.0 | 1.0 | 1.0 | 23 | 56 | 1.00 |
| Mars | .1364 | .972 | 0.43 | 0.49 | 24 | 37 | 1.52 |
| Asteroids | ... | ... | ... | ... | ... | 2.74 | |
| Jupiter | 1491.0 | .227 | .0372 | 2.45 | 9 | 55 | 5.20 |
| Saturn | 772.0 | .131 | .0111 | 1.09 | 10 | 29 | 9.54 |
| Uranus | 86.5 | .167 | .0026 | 0.76 | ... | 19.18 | |
| Neptune | 76.6 | .321 | .0011 | 1.36 | ... | 30.03 | |
