AT THE OBSERVATORY AT PARAMATTA 
79 
Mean Right Ascensions. 
j3 Hydri. 
a Eridani. 
1828. 
Super, and in- 
ferior Culmi n 
of /3 Hydri by 
Equal Alt. 
Apparent 
Right As- 
cension. 
Red" to 
M" Place, 
Jan. 1, 
1828. 
Mean At, 
Jan. 1, 1828, 
in Time. 
1828. 
Super, and In- 
ferior Culmi 11 
of a. Eridani 
by Equal Alt. 
Apparent 
Right As- 
cension. 
Red" to 
M a Place, 
Jan. 1, 
1828. 
Mean Al, 
Jan. 1, 1828, 
in Time. 
h 
m 
S 
h 
in 
s 
s 
h 
m 
S 
h 
m 
S 
h 
m 
S 
s 
h 
m 
s 
Mar. 7 
0 
16 
48.89 
0 
16 
28.85 
+ 7.37 
0 
16 
36.22 
Mar. 21 
1 
31 
26.32 
1 
31 
14.02 
+ 2.115 
1 
31 
16.135 
8 
0 
16 
47.88 
»> 
28.08 
7.39 
35.47 
30 
1 
31 
28.89 
15.705 
2.205 
17-91 
8 
12 
16 
45.21 
25.61 
7.393 
33.00 
Apr. 1 
1 
31 
29.06 
16.46 
2.212 
18.673 
10 
12 
16 
45.85 
27.25 
7.43 
34.68 
2 
13 
31 
29.25 
15.84 
2.215 
18.055 
11 
0 
16 
43.73 
25.38 
7.45 
32.83 
2 
1 
31 
29.04 
14.81 
2.219 
17-029 
12 
0 
16 
42.6 
24.65 
7.462 
32.11 
2 
13 
31 
28.11 
14.39 
2.226 
16.616 
13 
0 
16 
43.67 
25.60 
7.48 
55 
33.08 
3 
l 
31 
28.05 
14.83 
2.233 
17-063 
13 
12 
16 
42.02 
24.15 
7+87 
31.64 
5 
1 
31 
28.57 
16.38 
2241 
18.621 
14 
0 
16 
41.85 
24.55 
7.495 
32.04 
7 
1 
31 
29.79 
15.68 
2.25 
17.93 
16 
12 
16 
40.68 
24.93 
7.527 
32.46 
9 
1 
31 
29.81 
14.55 
2.25 
16.80 
18 
12 
16 
41.54 
26.93 
7.559 
34.49 
9 
13 
31 
29.55 
14.42 
2.25 
16.676 
19 
0 
16 
39.69 
25.01 
7.534 
32.54 
10 
1 
31 
29.06 
14.07 
2.247 
16.317 
29 
0 
16 
39.86 
26.67 
7.510 
34.18 
10 
13 
31 
29.54 
14.69 
2.247 
16.937 
31 
12 
16 
40.29 
27.13 
7.496 
55 
34.63 
11 
1 
31 
29.96 
15.24 
2.247 
17.487 
31 
0 
16 
41.11 
28.31 
7.49 
35.8 
11 
13 
31 
29.12 
15.45 
2.246 
17.696 
Apr. 1 
12 
16 
40.16 
28.51 
7.483 
35.99 
12 
1 
31 
28.76 
16.14 
2.246 
18.386 
1 
0 
16 
42.12 
25.93 
7.47 
33.40 
12 
13 
31 
28.66 
16.65 
+ 2.246 
18.896 
2 
12 
16 
40.71 
55 
27.89 
7.463 
55 
55 
35.35 
2 
0 
16 
39.44 
>) 
55 
27.36 
7.456 
55 
5> 
34.82 
Mean Right Ascension 
Jan.l 
, 1828, « Eridani 
1 
31 
17-484 
3 
12 
16 
40.41 
26.22 
7.445 
33.66 
3 
0 
16 
41.64 
27.51 
7.435 
34.95 
4 
0 
16 
41.22 
28.94 
7.424 
36.36 
5 
0 
16 
40.3 
29.03 
7.414 
36.44 
9 
0 
16 
41.92 
26.66 
7.315 
>5 
55 
33.97 
10 
12 
16 
41.44 
26.32 
7.286 
33.61 
10 
0 
16 
41.59 
26.60 
7.273 
33.87 
11 
0 
16 
41.10 
26.38 
7.259 
33.64 
12 
0 
16 
39.02 
}» 
55 
26.40 
+ 7.232 
5> 
33.63 
Mean Right Ascension, Jan. 1, 1828, /3 Hydri 
0 
16 34.04 
Before the conjunction the superior culminations take place immediately 
after noon of the given, but after conjunction immediately before noon of the 
next following day ; but in the above Table they have been reduced to, and 
placed opposite to the days nearest the noon whereon they had been observed. 
I remark again that my object in observing equal altitudes was to have a 
check upon the transit, by a method independent of the errors arising from 
imperfections of the latter instrument, which were the more dangerous as, in- 
clining all towards the same side, their apparent consistency made it difficult 
to discover their cause, and to subject them to mathematical laws, which we 
shall endeavour to do hereafter. Although observations of equal altitudes 
will deviate more on each side of their mean, this mean may be nearer the 
