1831.] 
On observing the Polar Star. 
171 
h 
m 
s 
Sun’s AR. Corrected, 
• • • • 
20 
02 
39 
Time of Observation, 
• • * • 
18 
21 
30 
AR. of Meridian, 
14 
24 
09 
AR. of Polaris, 
0 
59 
44 
Hour Angle, , 
13 
24 
25 
.Or in space, . . 
06' 
15" 
Hour Z. .... 
21 
°06' 
15" 
Sin. 
9,5564 
N. P. D 
1 
35 
34 
Sin. 
8,4437 
Altitude, .... 
26 
39 
0 
Sec. 
0,0488 
Polaris E, . . 
0 ( 
5 38' 
29" 
Sin. 
8,0489 
Observed Angle, 186° 4 7' 00 ' ' 
Polaris East, 0 38 29 
True bearing of Station,.. 187° 25' 29" 
Or the Logarithm of the star’s N. P. 
D. may be used $ the resulting logarithm 
will be the logarithm of the Azimuth, 
instead of the Log. Sine : Thus, 
Hour angle, .. 21° 6' 15" Sin. 9,5564 
N. P. D 1 35 34 Sin. 3,7585 
Altitude, .... 26 39 0 Sec. 0,0488 
Log. of 2310" = 3,3637 
And 2310" = 0° 38' 30" as before. 
Table of the Azimuths of the Pole-star, for every 10 minutes of the Horary Angle t 
or distance from the meridian in time ; 1st January, 1830. 
Hours. 
Minutes. 
Correction for Altitude for 
elongation in Azimuth. 
0 
10 
20 
30 
40 
50 
5° 
10° 
15° 
20° 
25 u 
3u° 
0 ' 
o ' 
o / 
o • 
0 
0 
/ 
/ 
/ 
/ 
9 
9 
/ 
0 
0 0 
0 04 
0 08 
0 13 
0 
16 
0 
20 
+ o 
+ 0 
+ 1 
+ 2 
+ 3 
+ 4 
1 
0 25 
0 28 
0 32 
0 36 
0 
40 
0 44 
0 
1 
2 
3 
3 
4 
4-T 
00 
2 
0 48 
0 51 
0 55 
0 58 
1 
01 
1 
04 
0 
1 
2 
4 
5 
7 
o 
3 
1 08 
1 10 
1 13 
1 16 
1 
18 
1 
21 
0 
1 
3 
5 
7 
10 
4 
1 23 
1 25 
1 27 
1 29 
1 
30 
1 
32 
0 
1 
3 
6 
9 
13 
C 
O 
5 
1 33 
1 34 
1 34 
1 35 
1 
35 
1 
36 
0 
1 
3 
6 
9 
14 
ci 
6 
1 36 
1 36 
1 35 
1 35 
1 
34 
1 
34 
0 
1 
3 
6 
10 
15 
fcC 
a 
7 
1 33 
1 32 
1 30 
1 29 
1 
27 
1 
25 
0 
1 
3 
5 
10 
14 
JO 
8 
1 23 
1 21 
1 18 
1 16 
1 
13 
1 
11 
0 
1 
3 
4 
9 
13 
W 
9 
1 08 
1 05 
1 01 
0 58 
0 
55 
0 
51 
0 
1 
2 
3 
7 
10 
10 
0 48 
0 44 
0 40 
0 36 
0 
32 
0 
28 
0 
1 
2 
2 
5 
7 
11 
0 25 
0 20 
0 16 
0 13 
0 08 
0 04 
0 
0 
1 
2 
3 
4 
12 
0 0 
0 04 
0 08 
0 13 
0 
16 
0 
20 
0 
0 
1 
2 
3 
4 
13 
0 25 
0 28 
0 32 
0 36 
0 
40 
0 
44 
0 
1 
2 
3 
3 
4 
* 
14 
0 48 
0 51 
0 55 
0 58 
1 
01 
1 
04 
0 
1 
2 
3 
5 
7 
4-3 
(ff 
15 
1 08 
1 10 
1 13 
1 16 
1 
18 
1 
21 
0 
1 
2 
4 
7 
10 
W 
16 
1 23 
1 25 
1 27 
1 29 
1 
30 
1 
32 
0 
1 
3 
5 
9 
13 
a 
17 
1 33 
1 34 
1 34 
1 35 
1 
35 
1 
36 
0 
1 
3 
6 
10 
14 
i o 
+3 
18 
1 36 
1 36 
1 35 
1 35 
1 
34 
1 
34 
0 
1 
3 
6 
10 
15 
a 
bC 
19 
1 33 
1 32 
1 30 
1 29 
1 
27 
1 
25 
0 
1 
3 
6 
10 
14 
a 
o 
20 
1 23 
1 21 
1 18 
1 16 
1 
13 
1 
11 
0 
1 
3 
5 
9 
13 
E 
21 
1 08 
1 05 
1 01 
0 58 
0 
55 
0 
51 
0 
1 
2 
4 
7 
10 
22 
0 48 
0 44 
0 40 
0 36 
0 
32 
0 
28 
0 
1 
2 
3 
5 
7 
23 
0 25 
0 20 
0 16J 
0 13 
0 
08 
0 
04 
0 
0 
1 
2 
3 
4 
By the Table for the Deviation. 
Hour angle, 13h. 24m. 25s. 
Table, 13 20 —32' 
Diff. per 5m. — (- 2 
Correction for Altitude, -f* 4 
Elongation East, 38' 
Magnetic bearing N. 49 W. 
Deviation East, l® 27' 
