M. Struve’s Observations on Double Stars. lOT 
nished 5° 32, in 21 years, but this seems to be an error from 
the following calculations. 
1755, 
Distance, 13".88 
Angle of positic\n, 53° 3' 
Bradley. 
1781.9, 
14.50 
56 46 
Herschel. 
1800, 
15.91 
/ 56 1 
Piazzi. 
1802.8, 
51 14 
Herschel, 
1819.7, 
14'24 
55 20 
Struve. 
40. * Bootes. R. Asc. 14‘‘ 10'. Decl. 12' N. 
4th-5th, and 9th Mag. 
Angleof position in 1779, Foil. Herschel. 
Distance, . . 37'^56 Ditto. 
Angle of position, 1819, 50*’ 55' N. Foil. Struve. 
Distance, . . 38".55 Ditto. 
Difference of declination, 32 .29 Ditto, 
Diff. of B. Asc. 1817, ‘ + 2 .29 Ditto. 
41. £ Bootes. R. Asc. 14^ 37'. Decl, 27"^ 51' N. 
3d-4th and 7th Mag. 
The greatest of these stars is yellow^ and the leasts blue. 
Angle of position in 1780.7, was 32° 19' N. Free. J^erse^e?. 
1802.2, 44 52 ditto, Ditto. ^ 
Observed, . .1819, 51 7 ditto, Struve, 
Diff. of R. Asc, . , — 0".232 Ditto, 
Diff. of declin. . . 1 ,5 
Angle of position deduced, 56° 5 
42. I Bootes. R. Asc. 14'' 43'. Decl. 19° 51' N. 
5 th and 7 th Mag. 
Angle of position in 1782.3, 65° 53' N. Preced. Herschel, 
1792.2, 94 16 Ditto. 
1795.2, 95 4 Ditto. 
1802.3, 96 34 Struve. 
1819.6, 105 0 Ditto, 
Diff, of R. Asc. . — ' 0" 102 
43. 39 Bootes. R. Asc. 14’^ 43'. Decl. 49° 27' N. 
6th-7th and 8th-9th Mag. 
Sir W. Herschel observed the angle of position to be 38® 
21' N. Foil, in 1783.5, and in 1819, Struve found it to be 
49“ 33' N. Foil. The difference of R. Asc. was -f G^'' 332, in 
1819, and hence the distance was 5". 
44. ^ Serpe7it. R, Asc. 15^ 26'. Decl. 11° 9' N. 
