[ 24 ] 
Y. 
OlS" THE DOUBLE STAR, STEUVE, 2120. Et J. E. GOEE, 
E. E. A. S., Honorary Associate and Yice-President of the 
Liverpool Astronomical Society. 
[Eead November 30, 1887.] 
Assuming that the apparent change of position in the components of 
this double star is due to uaiform rectilinear motion, I have computed 
the following formulae : — 
p2 = 4-9729 + 0-0225 {t - 1850-4)^, 
sec(3l7°-20-6) = 0-4484p. 
The following is a comparison between the measures and the posi- 
tions computed from the above formula?. The observed angles have 
been corrected for the effect of precession to 1880-0 : — 
Epoch. 
Observer, 
^0- 
ec 
00 - Oc. 
po- 
pc 
po - Re. 
o 
o 
o 
rt 
ft 
n 
1783-20 
Sir W. Herschel, 
41-62 
34-72 
(+ 6-93) 
11-88 
10-32 
+ 1-56 
1829-60 
Struve, 
11-10 
11-59 
- 0-49 
3-83 
3-83 
0-0 
1832-62 
7-92 
7-45 
+ 0-47 
3-54 
3-49 
+ 0-05 
1833-47 
2-22 
5-92 
- 3-70 
3-45 
3-38 
+ 0-07 
1834-67 
4-63 
4-05 
+ 0-58 
3-25 
3-26 
- 0-01 
1835-38 
358-13 
2-48 
- 4-35 
3-18 
3-17 
+ 0-01 
1835-65 
1-63 
1-95 
- 0-32 
3-20 
3-14 
+ 0-06 
1836-55 
359-84 
360-15 
- 0-31 
3-10 
3-05 
+ 0-05 
1841-12 
0. Struve, 
345-57 
349-21 
- 3-64 
2-83 
2-63 
+ 0-20 
1841-44 
Madler, 
346-77 
348-25 
- 1-48 
2-8 
2-60 
+ 0-20 
1842-49 
>) 
345-68 
345-15 
+ 0-53 
2-76 
2-52 
+ 0-24 
1842-55 
Kaiser, 
2-56 
2-52 
+ 0-04 
