4i6 



Tables 543-545. 



GEODETICAL AND ASTRONOMICAL TABLES. 



TABLE 543. — ^Leugtli of Degrees on the Earth's Surface, 



For more complete table sec " Smithsonian Geographical Tables," 



TABLE 544.— Equation of Time,; 



The equation of time when + is to be added to the apparent solar tinie to give mean time. 

 When the place is not on a standard meridian (75 th, etc.) its difference in lonrjitude in time 

 from that meridian must be subtracted when east, added when west to get standard time {75 th 

 meridian time, etc.). The equation varies from year to year cyclically, and the firj^^e foUov/ing 

 the -j- sign gives a rough idea of this variation. 



TABLE 545. — Planetary Data. 



♦Earth and moon. + Relative to earth. Inclination of axes: Sun r'-^S; Earth 23°.45; Mars 24*-6; 

 Tupiter3°.i; Sattirn ze'.S; Neptune 27°. 2. Others doubtful. Approximate rates 3f rotation: SunaSid; 

 Moon27jd; Mercury SSd; Venus sasd; Mars 24" s;"- ; Jupiter 9" 55™ 5 Saturn lo^ 14^, 



Smithsonian Tables. 



