distances and positions of 380 double and triple stars , &c. 399 
No. CCCLXII. R. A. 2 h io m ; Decl. 3 0 48' S. 
0 (Mira) Ceti ; VI. 1 ; Struve, 69 ; 
Large star about 6th or 7th magnitude. Certainly not more 
than the sixth. Small, almost imperceptible, yet bears 
sufficient illumination to measure the angle. The large 
star is variable. 
Position. 
9 1 
2. o H 
0.50 S 
November 27, 1821. 
Five-feet Equatorial. 
nf 
Mean = 1.25 
Position = i° 25' nf 
The angle agrees to 1' with that of Struve, i° 24' nf , 
which he considers as particularly correct “ certissim6 emen- 
sus sum.” The distance has not undergone that rapid change 
which Sir W. Herschel surmised to take place in this star, 
as is evident by comparing M. Struve's measure 11 4". 25, 
taken in 1819.88, with the mean of two very accurate ones 
in 1780.69, which gives nf.og^. Some mistake therefore 
must have been made in the measures l' 44".2i8 in the Cata- 
logue of 1782, from which the motion was concluded with 
so much certainty. On searching the Journal for 1780 
( September 8 ) two measures are found as follows : — 
1st meas. 2 Rev. 59^ P — 3 = 1' 44".o62. 
2d meas. 3 Rev. o P — 3 = 1 44 .374. 
The mean of these is T 44". 218, so that these are un- 
doubtedly the measures referred to. They are however er- 
roneously cast up, and a MS. correction (verified by re-com- 
putation) makes them respectively T 5o".3i2, and i' 50". 62 5 
