M. Struve’s Observations on Double Stars, 333 
difference of declination — Sir W. Herschel found the 
angle of position to be 4® S. Free. 
57. 73 Serpentarius, R. Asc. 18^ 0^ N. Decl. 3° 57'. 
6 th and 8 th Mag. 
Sir W. Herschel observes, that he could scarcely see this 
double star, of an oblong shape, with a power of 227, and that 
it required a power of 460 to see it double. M. Struve sup- 
poses that the distance has increased, as he can easily distin- 
guish them with a power of 126. He found ftie angle of posi- 
tion to be 5° 1' S. Free, a mean of three observations. Sir W. 
Herschel found it to be 2 ° 48'. 
58. ^ 59 Serpent. R. Asc. 18^ 18'. N. Decl. 0° 5'. 
5th and 8 th Mag. 
These stars have very fine colours, the one being yellowish^ 
and the other of a fine blue colour. The difference of R. Asc. 
in 1819 was — 0",192, and the angle of position 40° 3', N. Free. 
Hence the distance is 3".66. Sir W. Herschel found the angle 
of position to be 45° N« Free., and in 1802 the distance was con- 
siderably increased, though the angle remained the same. This 
observation is confirmed by M. Struve. 
59. g and 5 Lyra. R. Asc. 18^ 38'. N. Decl. 39^^ 27'. 
5th and 6th-7th Mag., and 5th and 5th Mag. 
There are here two double stars, which M. Struve observed 
as fi 3 liows. 
6 Lyra, 5th and 6th-7th mag. S Lyra^ 5th and 5th mag. 
Diff. of R. Asc. + 0".106 + (T'.OSS 
Angle of position, 60° 7 N. Foil. 70° 3 S. Foil. 
The distances by projection observed once, were, for s = 3".835 
and for 5 Lyra = 3".43. ' Sir W. Herschel conjectured that the 
angle of position changed. The angles of position were, 
tLyra, in 1779, 56° 5' S. Foil. 5 Lyra, 83° 28' 
1804, 59 14 75 35 
1819, 60 42 70 18 
VOL. X. NO. 20. APRIL 1824. 
2 
