AT THE OBSERVATORY AT PARAMATTA 
71 
a Eridani. 
2 « 
Centauri. 
1826. 
Sidereal 
Time. 
Culmination 
by Clock by 
the Hour- 
angle. 
Error of 
Clock. 
Aberr. and 
Nutat. in 
arc. 
Precess. to 
1827. 
Mean Right 
Ascension, 
Jan. 1, 1827, 
in Degrees. 
1826. 
Sidereal 
Time. 
Culmination by 
Clock deduced 
from the Hour- 
angle. 
Error of 
Clock. 
Aberr. and 
Nutat. in 
arc. 
Precess. to 
1827. 
Mean Right Ascen- 
sion, Jan. 1, 1827, 
in Degrees. 
h 
m 
h 
m 
s 
S 
h 
m 
h 
m 
S 
s 
July 30 
4 
48 
1 31 
16.77 
-0.59 
-10.44 
+ 13.37 
22 
49 
5.93 
July 10 
10 
7 
14 
27 55.46 
+ 1.48 
—41.47 
30.76 
216 59 
3.39 
31 
4 
50 
39 
99 
16.72 
-0.31 
11.09 
13.17 
99 
99 
8.23 
14 
9 
59 
99 
99 
57.08 
-1.36 
39.06 
30.09 
99 
58 
46.83 
Aug. 1 
4 
44 
99 
„ 
16.88 
-0.20 
11.64 
13.09 
99 
99 
11.65 
15 
9 
59 
99 
99 
57.72 
-1.44 
38.35 
29.86 
99 
58 
55.71 
3 
5 
30 
39 
„ 
15.78 
-0.06 
12.76 
13.04 
99 
48 
56.08 
16 
9 
57 
99 
99 
58.29 
-2.09 
37.84 
29.64 
99 
58 
54.80 
4 
5 
17 
39 
„ 
15.59 
+0.10 
13.31 
12.94 
99 
99 
54.98 
17 
9 
52 
99 
99 
59.10 
-2.88 
37.23 
29.42 
99 
58 
55.49 
10 
5 
36 
99 
„ 
14.40 
+ 1.34 
16.60 
12.37 
99 
99 
51.87 
18 
10 
5 
99 
99 
58.98 
-3.08 
36.60 
29.08 
*9 
58 
50.48 
11 
4 
52 
99 
„ 
13.83 
+2.49 
17.15 
12.27 
99 
99 
59.95 
19 
10 
0 
99 
99 
59.50 
-3.45 
35.98 
28.75 
99 
58 
53.52 
19 
5 
21 
39 
„ 
18.1 
-2.07 
21.25 
11.60 
99 
99 
51.60 
25 
9 
43 
99 
99 
56.70 
-1.23 
32.19 
27.74 
99 
58 
47.61 
20 
5 
30 
39 
99 
19.07 
-2.70 
21.80 
11.53 
99 
99 
55.28 
28 
9 
44 
99 
99 
57.32 
-0.35 
30.28 
27.19 
99 
59 
11.46 
25 
5 
17 
99 
„ 
22.19 
-5.69 
24.13 
11.03 
99 
99 
54.40 
30 
10 
11 
99 
99 
56.39 
-0.31 
28.99 
26.74 
99 
58 
58.95 
Sept. 2 
5 
27 
99 
„ 
24.20 
-7.09 
27.63 
10.55 
99 
99 
59.52 
31 
9 
55 
99 
99 
57.30 
-0.41 
28.35 
26.52 
99 
59 
11.52 
4 
5 
19 
99 
» 
23.92 
-6.82 
28.27 
10.35 
99 
99 
58.58 
Aug. 2 
10 
0 
99 
99 
57.14 
-0.54 
27.07 
26.27 
99 
59 
8.2 
5 
5 
29 
99 
99 
23.37 
-5.95 
28.82 
10.25 
99 
49 
2.73 
4 
9 
49 
99 
99 
55.53 
-0.08 
25.79 
25.87 
99 
59 
6.83 
6 
5 
25 
99 
99 
23.32 
-5.75 
29.37 
10.15 
99 
99 
4.30 
5 
10 
2 
99 
99 
56.03 
+0.08 
25.15 
25.67 
99 
59 
2.17 
13 
5 
32 
1 
31 
21.00 
-3.21 
-31.68 
+ 9.69 
» 
99 
4.86 
12 
9 
47 
99 
» 
53.77 
+2.42 
20.67 
24.40 
99 
59 
6.58 
Mean .. 
22 48 59.33 
12 
10 
4 
” 
99 
53./5 
+2.43 
20.67 
24.40 
» 
59 
6.43 
28 
9 
42 
28 
1.47 
-6.28 
10.86 
21.72 
58 
58.71 
Annual Variation 
33.43 
W 
28 
9 
53 
99 
28 
1.25 
-6.28 
10.86 
21.72 
99 
58 
55.41 
Mean M. of a. Eridani, 
January 1, 1828... 
22 49 32.76 
Sept. 2 
10 
11 
99 
28 
2.33 
-7.15 
- 7.98 
21.06 
99 
59 
0.78 
Mean ... 
216 58 59.73 
Annual Variation .. 
1 
6.856 
Mean /ll of 2 a Centauri, January 1, 
1828 ... 
217 
0 
6.586 
2. Equal Altitudes. 
The object of these observations was the determination of the right ascen- 
sions of some of the principal stars of the southern hemisphere that are circum- 
polar at Paramatta, by a direct comparison with the sun, independent of the 
transit and of the solar tables. This comparison was made by deducing the 
superior and inferior culminations of the stars from a series of equal altitudes, 
which was kept on without interruption for the space of a month about the 
time of the Equinox ; and by deducing the true noon and midnight on the same 
days from equal altitudes of the sun, whereof the evening set was again con- 
nected with the morning set. This gave the difference of right ascensions 
between the sun and stars. The distance of the sun from the Equinox is finally 
derived from the observed declination of the sun on those days. 
