Earth 



Acceleration due to gravity (standard) ~ 980.665 centimeters per second per second 



= 32.1 740 feet per second per second 



Mass = 5,980,000,000,000,000,000,000,000,000 grams 



= 6,600,000,000,000,000,000,000 short tons 

 = 5,900,000,000,000,000,000,000 long tons 



Mean density = 5.51 7 grams per cubic centimeter 



Velocity of escape " 6.94 statute miles per second 



Curvature of surface = 0.8 foot per nautical mile 



Clarke speroid of 1 886 



Equatorial radius (a) = 20,925,874.05 feet 



= 6,975,291.35 yards 

 = 6,378,206.4 meters 

 = 3.963.234 statute miles 

 = 3,443.957 nautical miles 



Polar radius ib) = 20,854,933.76 feet 



= 6,951,644.59 yards 

 = 6,356,583,8 meters 

 = 3,949.798 statute miles 

 , V = 3,432.282 nautical miles 



Mean radius (^H^j = 20,902,227.28 feet 



= 6,967,409.09 yards 

 = 6,370,998.9 meters 

 = 3,958.755 statute miles 

 = 3,440.065 nautical miles 



1 ■ of equator = 6,087.090 feet 



= 2,029.030 yards 

 = 1,855.345 meters 

 = 1.153 statute miles 

 = 1.002 nautical miles 



V of latitude at equator = 6,045.889 feet 



= 2,015.296 yards 

 = 1,842.787 meters 

 = 1.145 statute miles 

 = 0.995 nautical mile 



r of latitude at pole = 6,107.795 feet 



= 2,035.932 yards 

 = 1,2861.656 meters 

 = 1.157 statute miles 

 = 1.005 nautical miles 



Flattening or ellipticity ( f =—- — ) = 1 



I 3 / 294.98 



= 0.00339007530 



Eccentricity (e = sj2f- f^) = 0.08227185422 



Eccentricity squared (e^ ) = 0.00676865800 



Clarke spheroid of 1 880 



Equatorial radius {a) = 20,926,014.29 feet 



= 6,975,338.10 yards 

 = 6,378,249.145 meters 

 = 3,963.260 statute miles 

 = 3,443.980 nautical miles 



Polar radius (b) = 20,854,707.61 feet 



= 6,951,569.20 yards 

 = 6,356,514.870 meters 

 = 3,949.755 statute miles 

 / 9 + + /i \ ^ 3,432,245 nautical miles 



Mean radius ( -2_ — \ = 20,902,245.39 feet 



= 6,967,415.13 yards 

 = 6,371,004.387 meters 

 = 3,958.759 statute miles 

 = 3,440.068 nautical miles 



715 



