SYNOPTICAL TABLES.
339
| Rate per minute at which equator rotates, in miles, | 17 |
| Rate per second of her velocity in orbit, in miles, | 20 |
| Days in falling to the Sun, | 64.6 |
| Volume (Earth's = 1), | 1-49th |
| Mass (Earth's = 1), . | 1-80th |
| Density (Earth's = 1), | 0.615 |
| Density (water = 1), | 3.37 |
| Diameter (Earth's = 1), | 0.264 |
| Diameter in miles, | 2164.6 |
| Diameter apparent, mean, | 31′ 7″ |
| Diameter apparent minimum, | 29′ 21″.9 |
| Diameter maximum. | 33' 3″.1 |
| Gravity at surface (Earth's = 1), | 1-6th |
| In one second of time bodies fall, in feet. | 2-6 |
| Centre of figure nearer the earth than centre of gravity, in miles, | 33 |
| Elevation of highest mountain in the Moon (Doerfel), in feet, | 24,945 |
| Elevation of highest mountain (Moon's diam. = 1), | 1-454th |
| Elevation of highest mountain on the Earth, in feet, | 28,180 |
| Elevation of highest mountain(Earth's diam. = 1) | 1-1480th |
| Greatest depth of craters below the general surface in feet, | 17,000 |
| Greatest diameter of craters, or cavities with or without raised walls, in miles, | 55 |
| Greatest diameter„ of walled plains, in miles, | 150 |
| Greatest height of central cone, in feet. | 5000 |
| Longest bright ray (Tycho), | 1800 |
| Rills, greatest length in miles, | 150 |
| Rills greatest breadth in feet, | 6000 |
| Rills number, | 90 |
