$66 Dr. Herschei/s Account of the Changes 
so that we have good reason to ascribe the change which has 
happened in the situation of our two stars, to a proper motion 
of & 
e Draconis. I, 8. 
In this star, we have to notice a great change of the angle of 
position, but none in the distance. In the year 1782, Sept. 4, 
with 4,60, I found the stars to be if- diameter of L. asunder. 
May 22, 1804,. they were still at the same distance of i-§- dia- 
meter of L. Oct. 20, 1781, the position was 6 $° 14' north- 
preceding; and. May 22, 1804, it was 84° 29'; which proves a 
change of 21 0 15', in 22 years and 214 days. This cannot be 
owing to a parallactic motion of the large star ; for the effect 
arising from such a motion, would have been directly contrary 
to the change which has taken place : the angle of position 
would have undergone a direct, instead of a retrograde altera- 
tion. We are consequently assured that s Draconis cannot be at 
rest. If future observations on the proper motion of the stars 
should furnish us with that of e, and if this motion should also 
fail to explain my observed change of the angle of position, 
without a change of distance, we shall then have good reason to 
admit this star into the list of those that have a small one 
revolving about it. For, to ascribe an additional and inde- 
pendent motion to the small star, would be to have recourse to 
three separate motions, of given velocities, in given directions, 
and at given distances ; the improbability of which has been 
sufficiently pointed out. 
1 £ Aquarii. II, 7. 
The position, Nov. 2 6, 1779, was 71 0 5' north-following. 
Sept. 24, 1781, it was 71 0 39'. June 19, 1782, 72 0 7'. Jan. 3, 
1802. 78° 3'. The change is 6 ° 38', in 22 years and 38 days. 
