336 M. Struve and Prof. Amici’s Observations on Double Stars. 
Sir W. Herschel found the distance in 1778 to be 5".156. 
In 1759, 
Angle of Position. 
56. °52 Bradley. 
1779, 
32. £7 Herschel. 
1803, 
40. 43 Ditto. 
1813, 
- 2. 53 Struve. 
1819, - a 
0. 24 Ditto. 
R. Asc. 10 h O'. 
Decl. 20° 45, N. 
2.3 Mag., and 4th Mag. 
M. Struve considers the large star as reddish, bordering on 
yellow, and the smaller as of a green colour ; while Sir W. Her- 
scliel calls the first white, and the second reddish. In 1819, 
M. Struve found the difference of R. Asc. to be 0 h .262, and the 
distance 3". 74. 
In 1782, Angle of Position, = 7°.37 Herschel . 
1823, - - - 6 .21 Ditto. 
1820, * - - 10 .32 Struve. 
6. g. Great Bear. R. Asc. ll h 9'. 
Decl. 32° 33' N. 
4.5 Mag., and 6th Mag. 
In 1819, M. Struve found 
the difference of R. Asc. to 
be 0".212, and the distance 2."73. 
Angle of Position. 
In 1781.97, 
- 
306° 13' Herschel . 
1802.10, 
- 
352 29 Ditto. 
1804.08, 
- 
357 22 Ditto. 
1819,10, 
- 
165 27 Struve. 
1820.13, 
- 
173 39 Ditto. 
Consequently, in 38^th years, 
the 
small star has performed 
227° 26' of its revolution round the great one, in an apparent 
orbit of great ellipticity, as may be conjectured from the diffe- 
rent velocities of its motion. For, 
Motion. Mean Annual Motion. 
From 1781.97 to 1804.08 = 51° 09 7 2° 18' 
1804.08 1820.13 = 176 17 10 59 
Hence we may conjecture that the star performs a revolution 
in 60 years. 
7. 83. Lion . R. Asc. llh 18. Decl. 4° 0' N. 
6.7 Mag., and 7.8 Mag. 
In 1780, Angle of Position, = 55° S. Foil. Herschel. 
1802, Angle of position, 62°.05 Struve. 
Distance, - 30" Ditto. 
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