373 
in the relative Situation of double Stars. 
supposing the stars to be equal ; and the last, with 527, make 
it a diameter of the smallest ; the stars being then considered as 
pretty unequal. If the difference of the parallactic motion of the 
two stars should be sufficiently considerable, that motion would 
account, not only for the change of the angle of position, but 
also for a smail increase of the distance of the two stars. 
<r Coronce. I, 3. 
This star has undergone a great change. The position of the 
two stars, Oct. 15, 1781, was 77 0 32' north-preceding; but. 
Sept. 6, 1802, it was 78° 36' north- following ; which gives an 
alteration of 23 0 52', in 20 years and 326 days. The great 
number of small stars in this neighbourhood, is not favourable 
to a supposed connection between any of them and <r Coronas. 
As the two stars are considerably unequal, we may suppose the 
large one to be affected by a parallactic motion, which will suffi- 
ciently account for the angular change. 
e Lyra. II, 5 and 6 . 
This remarkable double-double star has undergone a change 
of situation in each double star separately, which is not very 
considerable, but deserves our notice, on account of a certain 
similarity in the directions of the alteration. The position of II, 5, 
Nov. 2, 1779, was 56° 5' north-following; and, by a mean 
of three observations, taken Sept. 20, 1802, May 26, and 2 g, 
1804, it was 59° 14/ ; which gives a change of 3 0 9' ; the motion 
of the angle being retrograde. The position of II, 6, on the 
same days, was 83° 28', and 75 0 35', south-following. This gives 
a difference of 7 0 33' ; the motion being also retrograde. Now, 
from the position of the apex of the translation of the solar 
