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<title>Moon Fact Sheet</title>
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<h3>Moon Fact Sheet</h3>
<img src="../images/earth">Earth
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<h4>Moon/Earth Comparison</h4>

<h5>Bulk parameters</h5>
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                                   Moon         Earth      Ratio (Moon/Earth)
Mass (10<sup>24</sup> kg)                    0.07349       5.9736     0.0123    
Volume (10<sup>10</sup> km<sup>3</sup>)                 2.1973      108.321      0.0203
Equatorial radius (km)	           1738          6378      0.2725      
Polar radius (km)                  1735          6356      0.2730
Volumetric mean radius (km)        1737.5        6371      0.2727
Ellipticity                       0.002         0.0034     0.588    
Mean density (kg/m<sup>3</sup>)               3340          5520      0.6051      
Surface gravity (m/s<sup>2</sup>)            1.62          9.78       0.166    
Escape velocity (km/s)            2.38         11.2        0.213    
GM (x 10<sup>6</sup> km<sup>3</sup>/s<sup>2</sup>)                 0.0049        0.3986     0.0123 
Bond albedo                       0.067         0.385      0.174
Visual Geometric Albedo           0.12          0.367      0.327    
Visual magnitude V(1,0)          +0.21         -3.86          -
Solar irradiance (W/m<sup>2</sup>)            1380          1380      1.000      
Black-body temperature (K)          274.5         247.3    1.110      
Topographic range (km)               16            20      0.800      
Moment of inertia (I/MR<sup>2</sup>)         0.394         0.3308     1.191
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<h5>Orbital parameters (for orbit about the Earth)</h5> 
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                                    Moon         
Semimajor axis (10<sup>6</sup> km)             0.3844                 
Perigee (10<sup>6</sup> km)                    0.3633
Apogee (10<sup>6</sup> km)                     0.4055
Revolution period (days)           27.322              
Synodic period (days)              29.53               
Mean orbital velocity (km/s)        1.023                  
Orbit inclination (deg)             5.145                    
Orbit eccentricity                  0.0549              
Sidereal rotation period (hrs)    655.728                
Equatorial inclination (deg)        6.68                   
Recession rate from Earth (cm/yr)   3.8
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