The general Characteristics of the frequencyfunction of stellar movements 



Finally ^ l d' 1 d' u , ^d' 8 d' 13 , %d' 6 d' u , 2 d' 9 rf' 13 have to be computed directly. 

 All the other 240 sums of products vanish. 



As seen the labour will be immensily reduced by those circumstances. 



Further a variety of equations may be developed to be used as control 

 formulée. 



Most of tbe computations for the normal equations have been made by a 

 clerk and with the aid of the calculating machines »Original Odhner» and » Burroughs 

 Addition Machine». They have also been thoroughly and completely checked by 

 help of several control formulae. 



