THE GREEK SYMBOLS. 



5CQ 



rateis just counterbalanced by the attraction of gravitation, and the course round 

 the sun gives us varying seasons, day and night. There are many subjects 

 relating to the earth which will be more properly included under Physical 

 Geography. We may here just add the diameter of the earth, and proceed 

 to inquire concerning the moon. The polar diameter of our globe is 7,899 

 miles; the equitorial diameter 7,925 miles. It is distant from the moon 

 238,500 miles. We will close this chapter with the letters and characters 

 of the Greek alphabet used in astronomical works to designate the stars. 



A a = Alpha 

 B /3 = Beta 

 r y = Gamma 

 A 8 = Delta 

 E = Epsllon 

 Z C = Zeta 

 H T) = Eta 

 e = Theta 



I i = Iota 

 K K Kappa 

 A X = Lambda 

 M/i = Mu 

 N v = Nu 

 S | = XI 

 O o = Omicron 



IlTT = Pi 



P p = Rho 

 ^ a- = Sigma 

 T T = Tau 

 Y u = Upsllon 

 *$ = Phi 

 X X = Chi 

 * ^ = Psi 

 Q w = Omega 



Fig. 558. A ship disappearing below the horizon. 



