■^-io-J 



^^ 



Q. 



1 



\ 1 



"**^ 





i>'T* 



\ 





S/T 









— 



y 



<i)'(0p',A.p' 



/ 



/ 



/ 



/ 



/ 



X 



/ 



X' 



/ 



K^^ 



ry 



\ 



i z_ :r-^^^ _^_ V - - 



\ 



V 



/ 



/ 



/ 



/ 



\ / / 



y 



/ 



Figure 3. Parallels at a given distance from a great circle track. 



26 



