( ^75 ) 



the times -|- f^ and — t^ , the former of the resulting equations will 

 only contain the ([uantities d(a'^), (fa, i'^ and ,i', the latter only y 

 and cIM. 



In this way the following equations have been derived for 

 successive intervals of six hours counted from the l^^"-, resp. 2"'^ 

 minimum. 



They do not rest however on the above elements but on those 



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