distances and positions of 380 double and triple stars , &c. 207 
s Bootis continued. 
The measures arranged in order are, 
Position. 
1781.73; 35 0 7' np ; H. mean of 6 measures, from Aug. 31, 1780, to Feb. 26, 
1783 (MSS.) 
1796.63 ; 45 32 np ; Ditto, single measure “ Account of Changes, &c.” 
1803.01 ; 44 39 np ; Ditto, mean of 8 measures, from Jan. 28, 1802, to March 26, 
1803 , ct Account of Changes, &c. Phil. Trans. 1803” and MSS. 
1819.60; 54 6 np ; Struve, Additamenta, a mean of two measures, and seven 
estimations. 
1822.55 5 5 Z 59 n P ’ H. and S. ut supra, mean of 62 measures. 
Distance. 
1780.31 ; 4". 062 ; H. single measure, MS. “ too full, no doubt.” 
1816.04; 2 * 35 °; Amici, mean of 3 measures in 1815 and 1817. Vide Zach Corr. 
Astron. Vol. 8, page 73. 
1819.6 ; 4 .963 ; computed from a set of observations of differences of R. A. by 
Struve (Additam. 189), where he makes the difference of 
R. A. = o s .23 2 in time. 
1822.55 ; 3 .931 ; H. and S. ut supra, mean of 26 measures. 
The angular motion is indisputable. Taking the mean 
dates 1781.73 and 1822.5,5 as epochs, the angle described in 
the interim was i7°.86, and the time 4,o y .8, giving a mean 
annual motion of o°.4,378 in the direction nfsp, or direct. 
Supposing it uniform, the position at the epoch 1803.01 should 
have been 44 0 26', instead of 44 0 39', which the observations 
give. The difference is too trifling for notice. 
