in the relative Situation of double Stars. 381 
right ascension and polar distance, this star, in 21 years and 
144, days, must have moved about 3", 481, in an angle of 79 0 29' 
33", towards the north-following part of the heavens. This 
would consequently remove it from the small star, which is 
placed almost in an opposite direction, and would occasion hardly 
any change in its angle of position ; and these are the very phe- 
nomena which have been established by my observations. 
f Cancri. Ill, 19. 
The position of the stars, Nov. 21, 1781, was 88° 1 6' south- 
preceding; and, Feb. 7, 1802, it was 8T 47' south-following. 
The change is 9 0 37', in 20 years and 78 days ; and may be 
ascribed to a parallactic motion of the large star, which is in 
favour of the observed alteration. 
^ Capricorni. II, 51. 
The position, July 4, 3783, was 84° o' south-following; and, 
August 29, 1802, it was 86° 55' south-preceding. This gives a 
change of 9 0 3', in 19 years and 36 days ; and a motion arising 
from parallax will sufficiently account for it. 
North-preceding FI. 36 Andromeda. I, 89.* 
The position, July 28, 1783, was 73 0 30' south-following ; 
and, Sept. 19, 1802, it was 6 f 4'. The change is. 8 e 2 6', in 19 
years and 33 days. A parallactic motion of the large star would 
have occasioned the change of the angle to be direct, instead of 
retrograde. 
* The 241st Andromeda; of Bode’s Catalogue, gives us now the place of this 
star. 
