sm 
M; Struve's on DonUe Stars, 
William’s observations may be affected with some error. Chris-, 
tian Mayer is said to have observed this star. 
64. a Sivan, R. Asc. 19^^ S4'. N. Decl 27° 35'. 
4th and 5th Mag. 
One of these stars is yellow, and the other blue. The diffe- 
rence of Right Ascension is 2".208, and the angle of position 
35° 36 N, Following. Hence the distance is 35".96, and the 
difference of declination -{- 20". 67. Sir W. Herschel has found 
the same angle of position, but the distance is a little greater, vi^. 
39".53. It appears, however, from Bradley’s observations, that 
the distance has not increased since his time, as he found the dif- 
ference of Right Ascension to be -f- 32".5, and that of declina- 
tion -f 18".3. Hence the distance is 34".2. 
65. g Ai^row. R. Asc. 19^ 29'. N. Decl. 16° 4'. 
4th~5th and 7th~8th Mag. 
M. Struve found the difference of R. Ascension to be 6".27, 
and the angle of position 9° 1' N. Foil. Hence the distance is 
1' 31".5, and the difference of declination 14".48. Sir W. Her- 
schel found the angle of position to be 9° S. Foil. ; so that the 
change seems to have been 18°. There may be an error of Si 
in place of N here. 
66. tfc Eagle. R. Asc. 19^* 42'. N. Declin, 8° 24'. 
i st-2d and lOth-llth Mag. 
The small star is very difficult to see. M. Struve found the 
difference of R. Asc. to be 5".45 in 1819, and the angle of po- 
sition to be 57° 8 N. Preced. Hence the distance is 2' 19".l, 
and the difference of declination -f 2' 5". 2. Sir W. Herschel 
had observed the distance in 1781,6 to be 2' 23".3, and the 
angle 65° N. Free. Hence the difference of R. Ascension is 
67".5, or 4".50 in time. The difference of declination is -f 2' 
9".9, and consequently the relative motion in 38,2 years will be 
-P 14".25 in R. Asc. and — - 4".7 in declination. The following 
are the absolute motions in 38,1 years^ according to Bradley’s 
observations : 
For « Eagle, + 21".60 in R. Asc, -f in Decl .. 
For its comes, + 35'\85 12", 7 
z 2 
