distances and positions of 380 double and triple stars , &c. 45 
No. XXI. 
Position. 
O / 
5. o\ s 
5 - 5 S 
4 - 3 ° 
4 * 3 ° S 
Mean “ 4.46 
Nov. 13, 1823. 
Measures of AC. 
Seven-feet Equatorial. 
5th and 9th Mag. 
nf 
Position = 4°.46 ; nf 
Distance = 3'. 48/764 
Distance. 
Parts. 
955. Ojg 
955 - 7 S 
95 6- 1 ) 
952. 8 
95 7 - 6 ) 
Mean — 955.44 
Z — 4.01 
95 1 -43 
Distance. Epoch. 
Mean position AB; 88° 41' np or sf ; 9". 109; 1822.88 
AC; 4.4 6 nf ; 2>' $>" \ 1823.86 
Other measures of this Star are 
1756.00; Position 78° 46' sf; Mayer. Computed from dif- 
ferences of R.A. and Decl. 
1779.80; 84 o ; H. Account of changes, &c. 
1780.80; 86 5 np; Distance 10". 172 (9 measures) 
H. Catal. of 1782. 
1802.20; 89 10 ; — H. Account of 
changes, &c. 
1816.81; 87 27 sf; Herschel, jun. 
The position is undoubt- 
edly sf 
1819.88 ; 84 3 sf; — Struve, (2 meas) 
Additam. 182. 
1821.90; 86 54 np or sf; 9/123 Struve, 
Dorp. iii. pages 141, 142, 
144, from A decl. = 9". 11. 
The change therefore in the angle of position, surmised by 
Sir W. Herschel in his Account of Changes, &c. is not con- 
firmed. Indeed it was chiefly concluded by him from the 
angle deduced from Mayer's observations, which of course 
must be very precarious. On the other hand, the distance 
seems to be subject to a trifling decrease, though perhaps 
the circumstance of the diameters of the two stars being in- 
cluded in the measures of 1780, may account for the excess 
in those observations. 
* 
