loS 



TABLES 86-87. 

 MISCELLANEOUS GEODETIC DATA.* 



TABLE 86. 



Length of the seconds pendulum at sea level =7=39.01 2540+0.208268 sin 2 inches. 



=3.251045+0.017356 sin 2 feet. 

 =0.9909910+0.005290 sin 2 meters. 



Acceleration produced by gravity per second 



per second mean solar time . . . =^=32.086528+0. 1 7 1 293 sin 2 feet. 



=977.9886 + 5.2210 sin 2 centimeters. 



Equatorial radius =0=6378206 meters ; 



3963.225 miles. 

 Polar semi-diameter =.=6356584 meters ; 



3949.790 miles. 



Reciprocal of flattening= -^=295.0 



Square of eccentricity =^=^-^=0.006768658 



6378388+18 meters; 



39 6 3-339 miles - 



ss, 635^909 meters ; 



^ 3949-99 2 miles - 



^ 297.0+0.5 



i 



^ 0.0067237 0.0000120. 



Difference between geographical and geocentric latitude=0 0'= 



688.2242" sin 2 0i. 1482" sin 40+0.0026" sin60. 



Mean density of the Earth =5. 5 247 0.00 13 (Burgess Phys. Rev. 1902). 



Continental surface density of the Earth = 2.67 ") jjarkness 

 Mean density outer ten miles of earth's crust=2.4O / 



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

 Cthe greater: 



C-A i 



- =0.0032652 1 = -, ; 



C 306.259 



C ^=0.001064767 Ea*; 

 A =^=0.32 5029 Ea z ; 

 C =0.326094 a* ; 

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



TABLE 87. - Length of Degrees on the Earth's Surface. 



For more complete table see " Smithsonian Geographical Tables." 



SMITHSONIAN TABLES. 



