16 



PROCEEDINGS OF THE AMERICAN ACADEMY 



A simple computation shows that the direction of the motion is 

 nearly that of the position angle 256°. We have accordingly, 

 y=.s cos {p — 166°), and a; = s sin (^ — 166°). In the successive 



TABLE VI.— Path op 61 Cygni. 



columns of Table VI. are given a current number, the date, the 

 name of the observer, the corrected position angle, the distance, and 



