XC1V 



EPHEMERIDES AND AUXILIARY TABLES. 

 Parallax tables for Santiago. 



Vrims II Continued. 



a 



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

 8, 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 + d) 

 and as a correction for the measured differences, 



a) = . 



cos 2 d 



3(3 d)= ; 



