70 
MR. RUMKERS OBSERVATIONS 
consequently stationary ; the change of altitude was then proportional to the 
change of time, and the calculated hour-angle did not require the troublesome 
reduction of the middle of times to the middle of altitudes. 
Though it cannot be expected that absolute altitudes will give the right 
ascensions with the same consistency amongst themselves as observations with 
a transit instrument, the mean of a great number of them derived from obser- 
vations made on both sides of the meridian is more likely to be free from any 
constant errors to which the transit instrument may be subject. 
Canopus. 
182G. 
Sidereal 
Time. 
Culmination 
by Clock de- 
duced from the 
Hour-angle. 
Error of 
Clock. 
Abcrr. and 
Nutat. in 
arc. 
Precess. to 
1827. 
Mean Right 
Ascension 
Jan. 1, 1827, in 
Degrees. 
1826. 
Sidereal 
Time. 
Culmination 
by Clock de- 
duced from the 
Hour-angle. 
Error of 
Clock. 
Aberr. and 
Nutat. in 
arc. 
Precess. 
to 1827. 
Mean Right 
Ascension 
Jan. 1, 1827, in 
Degrees. 
June 
27 
h 
10 
111 
30 
h 
G 
in 
10 
s 
58.6 
s 
+6.22 
+20.51 
+ 10.20 
o 
95 
/ 
1 
49.01 
July 
25 
h 
10 
m 
33 
h 
6 
m 
20 
s 
5.79 
s 
-0.8 
+22.82 
+8.33 
o 
95 
// 
1 
45.90 
28 
tt 
19 
57.1 
5.94 
26.49 
10.10 
it 
„ 
22.20 
28 
10 
29 
ft 
tt 
6.05 
0.24 
21.97 
8.08 
it 
„ 
57.20 
30 
2 
7 
it 
19 
58.8 
6.00 
26.44 
9.91 
!> 
11 
48.35 
30 
2 
55 
ft 
it 
4.02 
0.4 
21.12 
7.93 
„ 
99 
41.67 
July 
5 
2 
it 
19 
59.73 
3.53 
26.18 
9.58 
II 
ft 
24.66 
31 
10 
33 
1 1 
tt 
6.05 
0.4 
20.99 
7.83 
>9 
91 
53.75 
6 
2 
»» 
20 
0.87 
3.08 
26.13 
9.52 
It 
ft 
59.25 
Aug. 
2 
10 
28 
It 
it 
5.77 
-0.35 
20.87 
7.73 
„ 
„ 
49.90 
7 
2 
n 
„ 
1.33 
2.40 
26.00 
9.46 
It 
ft 
34.41 
5 
10 
30 
ft 
it 
2.17 
+0.08 
18.60 
7.53 
8 
2 
»» 
ft 
1.73 
2.37 
25.89 
9.39 
>1 
ft 
36.78 
11 
10 
33 
ft 
tt 
3.89 
1.68 
16.33 
7.34 
„ 
„ 
47.17 
9 
2 
»> 
f> 
2.27 
1.84 
25.79 
9.32 
ft 
ft 
36.76 
12 
10 
32 
ft 
tt 
3.19 
2.47 
16.46 
7.24 
„ 
„ 
48.60 
10 
10 
30 
»> 
It 
3.40 
+1.48 
25.60 
9.22 
It 
If 
48.02 
12 
2 
31 
.. 
.... 


16.50 
7.24 
19 
„ 
36.61 
12 
2 
30 
ft 
4.7G 
-0.57 
25.41 
9.12 
It 
ft 
37.38 
13 
9 
51 
tt 
tt 
2.56 
+2.9 
16.60 
7.14 
„ 
„ 
45.64 
13 
10 
25 
ft 
5.8 
0.59 
25.25 
9.02 
ft 
ft 
52.42 
20 
10 
27 
It 
tt 
7.56 
-2.4 
13.66 
6.84 
,, 
99 
37.79 
13 
2 
49 
ft 
5.42 
0.97 
25.25 
9.02 
ft 
ft 
40.98 
26 
9 
59 
tt 
tt 
10.9 
5.4 
10.91 
6.54 
„ 
„ 
39.95 
14 
10 
22 
ft 
G.89 
1.33 
25.10 
8.92 
ft 
ft 
57.42 
28 
10 
12 
tt 
tt 
12.26 
6.28 
9.44 
6.40 
„ 
„ 
45.24 
14 
2 
54 
” 
ft 
G.17 
1 .67 
25.00 
8.90 
ft 
ft 
41.40 
Sept. 
1 
9 
44 
tt 
tt 
13.18 
7.18 
7.97 
6.25 
„ 
„ 
44.22 
15 
10 
1G 
it 
ft 
4.88 
1.44 
24.93 
8.85 
ft 
ft 
25.38 
1 
10 
1 
11 
tt 
13.10 
7.18 
7.97 
6.25 
99 
„ 
43.02 
15 
2 
56 
it 
ft 
G.37 
1.73 
24.89 
8.85 
It 
If 
43.34 
2 
9 
47 
tt 
tt 
13.57 
7.14 
7.47 
6.20 
„ 
„ 
50.12 
10 
10 
24 
it 
ft 
G.G 
2.0G 
24.77 
8.78 
It 
ft 
41.65 
3 
9 
51 
tt 
a 
12.81 
7.03 
6.97 
6.15 
„ 
„ 
39.82 
17 
III 
21 
ft 
6.32 
2.88 
24.58 
8.725 
fl 
ft 
24.90 
12 
9 
48 
tt 
tt 
10.14 
4.33 
2.20 
5.85 
19 
„ 
35.20 
17 
2 
57 
it 
ft 
7.4 
3.14 
24.58 
8.65 
It 
ft 
37.13 
1827. 
18 
10 
32 
it 
ft 
8.01 
3.20 
24.39 
8.65 
It 
ft 
45.64 
May 
9 
2 
23 
It 
it 
1.55 
+4.63 
16.87 
6.99 
„ 
„ 
42.58 
19 
10 
»t 
ft 
8.1 
-3.7 
+24.19 
+ 8.59 
ft 
ft 
38.78 
9 
2 
43 
• 1 
tt 
1.30 
+4.62 
+ 16.87 
+6.99 
» 
» 
38.68 
Mean 
Annual Variation .. 
Mean 7R, January 1, 
1828... 
95 
1 
42.09 
19.81 
95 
2 
1.90 
