HALL, ABKKRATION CONSTANT. 

 OBSERVATIONS OP POLARIS. CLAMP WKST. S. P. R. 



77 



18. Observation Equations. 



For the observations as given in the preceding section observation 

 equations can be wrriten of the form 



V = 80 - 8' + A 8 + A k. b sin ( O + B) f- TT b cos ( O + B). 



8' is the observed declination, computed from the zenith distance with 

 thelatitude + 42" 16' 48.0". 



80 is the declination of the Berliner Jahrbuch. 



Akisthe correction to the aberration constant, 20.445 ", and rr is the 

 parallax. The auxiliary quantities b and B are formed as follows: 

 b sin B = sin a sin 8 cos £ - cos 8 sin £ . 

 b cos B = - cos a sin 8. 



With the term a 8 would be included all constant corrections. 



