User:Milton Beychok/Sandbox2: Difference between revisions
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{|class=wikitable style="border: 2px solid gray;" | {|class=wikitable style="border: 2px solid gray; font-size: 90%;" | ||
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|+Earth's Moon: Facts & Figures | |+Earth's Moon: Facts & Figures | ||
!colspan=2 align=center|Physical Characteristics | !colspan=2 align=center|Physical Characteristics | ||
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|Orbit period around the Sun||365 Earth days<br/>13.359 Moon days | |Orbit period around the Sun||365 Earth days<br/>13.359 Moon days | ||
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|colspan=2|(a) Defining a celestial body's length of year as the<br/>time that it takes for the celestial body to travel the<br/>distance of its orbit around a larger celestial body. In<br/> other words, the orbit period of the Moon around the<br/>Earth is the Moon's length of year | |||
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Revision as of 01:00, 27 June 2011
| Physical Characteristics | |
|---|---|
| Mean circumference | 10,917.0 km |
| Mean radius | 1,737.5 km |
| Mass | 7.3477×1022 kg |
| Volume | 2.197×1010 km3 |
| Density | 3.344 g/cm3 |
| Surface area | 3.79367×107 km2 |
| Surface gravity | 1.624 m/s2 |
| Escape velocity | 2,376 m/s |
| Rotational and Orbital Characteristics | |
| Distance from Earth: Average Apogee (farthest) Perigee (closest) |
384,400 km 405,696 km 363,104 km |
| Rotation velocity around own axis | 4.6246 m/s |
| Rotation period around own axis (length of Moon day) |
655.73 hours 27.322 Earth days |
| Orbit distance around the Earth | 2.4134×106 km |
| Orbit velocity around the Earth | 1.0224 km/s |
| Orbit period around the Earth (length of "Moon year") (a) |
655.73 hours 27.322 Earth days |
| Orbit period around the Sun | 365 Earth days 13.359 Moon days |
| (a) Defining a celestial body's length of year as the time that it takes for the celestial body to travel the distance of its orbit around a larger celestial body. In other words, the orbit period of the Moon around the Earth is the Moon's length of year | |