XC1V 



KrilKMKRIIiES AND AUXILIARY TABLES. 

 Parallax tables for Santiago. 



II Continued. 



For correcting the Santiago observations for differential refraction we have, using as before, 

 o, 3, a, d, to denote the respective positions of the planet and its comparison-star ; K, the refrac- 

 tion from Bessel's third table, and the zenith distance : 



cos = sin n sin (N -j- ) 

 and as a correction for the measured differences, 



cos s d 





d)= JL 



sin 8 



