416 



TABLES 543-545. 



GEODETICAL AND ASTRONOMICAL TABLES. 



TABLE 543. Length, of Degrees on the Earth's Surface. 



For more complete table see " Smithsonian Geographical Tables.' 



TABLE 544. Equation of Time. 



The equation of time when -f- is to be added to the apparent solar time to give mean time. 

 When the place is not on a standard meridian (75th, etc.) its difference in longitude 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 figure following 

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



TABLE 545. Planetary Data. 



*Earth and moon, t Relative to earth. Inclination of axes: Sun 7. 25; Earth 23.45; Mars 24*.6; 

 Tupiters'.i; Saturn 26. 8; Neptune 27.2. Others doubtful. Approximate rates if rotation: SunaSid; 

 Moon27jd; Mercury 88d; Venus 225d; Mars 24"" 37"' ; Jupiter 9 h 55'" ; Saturn io h I4 m . 



SMITHSONIAN TABLE*. 



