io8 



Tables 86-87. 

 MISCELLANEOUS GEODETIC DATA/ 

 TABLE 86. 



Length of the seconds pendulum at sea level =/=39.oi2540+o.2o8268 sin^ <p inches. 



=3.251045+0.017356 sin^(^ feet. 

 =0.9909910+0.005290 sin^^ meters. 



Acceleration produced by gravity per second 



per second mean solar time . . . =^=32.086528+0.17 1293 sin^^ feet. 



=977.9886 + 5.22 1 o sin^ <p centimeters. 



Equatorial radius 

 Polar semi-diameter 



=^^6378206 meters ; 



3963.225 miles. 

 =(^=6356584 meters; 



3949.790 miles. 



u 



Reciprocal of flattemng= =295.0 



a—o 



Square of eccentricity =^^= — j— =0.006768658 



6378388+18 meters; ' 

 ^ 3963-339 miles. 

 ^ 6356909 meters ; 

 ? 3949-992 mUes. 



&, 297.0 + 0.5 



S," 0.0067237+0.0000120. 



Co Co 



I ^ 



J 



Difference between geographical and geocentric latitude=(/)— <^'= 



688.2242" sin 2 ^—1.1482" sin 4 ^+0.0026" sin 60. 



Mean density of the Earth = 5. 5247 + 0.0013 (Burgess Phys. Rev. 1902). 



Continental surface density of the Earth = 2.67 \ Harkness 



Mean density outer ten miles of earth's crust = 2.40 J 



Moments of inertia of the Earth; the principal moments being taken as A, B, and C, and 

 C the greater: 



— — — =0.0032652 1 = — 7 ; 



C -^ ^ 306.259 



C—.^ =0.001064767 ^£Z*; 



.,4 =^=0.32 5029 Ea^ ; 



C =0.326094 Ea^ ; 



where E is the mass of the Earth and a its equatorial semidiameter. 



TABLE 87. — Lengtb of Degrees on the Earth's Snrlace. 



For more complete table see " Smithsonian Geographical Tables." 



Smithsonian Tables. 



