Magnetic Declination, 1845. 
1 
TABLE XI. — Mean DiflFerence of a Single Observation of the Magnetic Declination, from the Monthly 
Mean at the corresponding Hour, for each Civil Day and Week in 1845. 
LlYli 
Dav 
Jan. 
Feb. 
March. 
April. 
May. 
June. 
July. 
Aug. 
Sept. 
Oct. 
Nov. 
Dec. 
1 
1-57 
' 
1-64 
' 
1-32 
' 
1-13 
' 
3-00 
' 
[1.94] 
1.45 
' 
3-23 
' 
1.94 
' 
1-33 
' 
2.51 
' 
1.07 
2 
1-91 
[1-55] 
[1-75] 
MO 
1.35 
122 
1.64 
253 
3.21 
0.92 
[2.07] 
1.51 
3 
1-35 
M3 
1-27 
1.49 
1.66 
Ml 
M4 
[2.06] 
271 
1.64 
201 
5. 05 
4 
1.53 
1-20 
1-47 
1-30 
[1.63] 
2.14 
1.42 
253 
1.88 
M2 
1.45 
3. 10 
5 
[1-63] 
2-39 
1-30 
091 
132 
0.93 
0.73 
195 
1.55 
[1.22] 
3.40 
2.16 
6 
1-74 
1-81 
1-54 
[1-24] 
1.45 
0.73 
[1.38] 
1.12 
1.33 
1.55 
1-31 
1-00 
7 
1-48 
1-20 
1-32 
1.40 
1-01 
1.42 
1.53 
1.40 
[1.92] 
0.98 
3.04 
[1.52] 
8 
1-79 
0-94 
1-24 
135 
0.72 
[1-30] 
1.71 
2.64 
2-93 
1.09 
1-69 
0.89 
9 
4-04 
[1.13] 
[1-29] 
0.99 
0.72 
203 
1.73 
2.01 
1-73 
3.01 
[1.65] 
121 
10 
3-82 
1-36 
1-08 
0-90 
0.84 
1.05 
1.59 
[1-75] 
2.10 
3.02 
1.23 
0.77 
11 
1-70 
0-95 
1-07 
Ml 
[1.00] 
1.62 
1.29 
MS 
1-22 
1.46 
152 
0.80 
12 
[2-28] 
0-53 
152 
0.83 
MO 
0-77 
MO 
1.84 
1.21 
[1-97] 
110 
1.12 
13 
1-70 
1-28 
1-78 
[1.98] 
Ml 
1.38 
[1.20] 
1.46 
1.39 
1.42 
0-98 
3.77 
14 
1-21 
M6 
2-71 
6.47 
1-49 
1.35 
1.21 
1-66 
[1.37] 
1.47 
1.03 
[1.91] 
15 
1-23 
1-24 
1-54 
162 
1.90 
[1.09] 
1-25 
1.83 
1.56 
1-45 
102 
2.60 
16 
1-38 
[1-22] 
[1.90] 
0.93 
1.64 
0.64 
0.78 
1.35 
0.70 
0.93 
[1-67] 
1-56 
17 
1-01 
1-63 
2-01 
1.14 
1-34 
M9 
1-26 
[1.50] 
2.12 
2.36 
2.96 
1.62 
18 
1-44 
0-95 
1-35 
1.81 
[1-60] 
124 
1.00 
2.42 
2-70 
1.28 
2.13 
1.68 
19 
[2-00] 
1-05 
1.99 
2.07 
2.53 
0-49 
1.49 
0-85 
1-74 
[2.25] 
1-88 
0.95 
20 
505 
1-78 
2.62 
[1.50] 
1-21 
100 
[Ml] 
0-87 
1.66 
2.34 
1.24 
1.22 
21 
1-80 
3-50 
1.32 
1.72 
1.01 
1.88 
0.96 
1.27 
[1.89] 
4.8O 
1.74 
[M8] 
22 
1-35 
2-01 
M7 
1-22 
1.70 
[1.05] 
053 
1-23 
1.39 
1.81 
112 
1.04 
23 
1-68 
[2-99] 
[2.38] 
1-04 
0.92 
0.78 
1.40 
170 
1.92 
1.30 
[1.47] 
1.24 
24 
2-07 
5'15 
3.72 
2.10 
M4 
M2 
2.15 
[1.35] 
1.91 
1.39 
1-28 
0.98 
25 
2-39 
2-92 
2-56 
2.07 
[M7] 
1.03 
5-58 
1.34 
5.47 
1.80 
1.79 
093 
26 
[2-40] 
258 
2-90 
1-29 
1.16 
0.64 
0.99 
1.68 
2.13 
[1-29] 
1.64 
0.97 
27 
2-34 
2-74 
200 
[1-97] 
0.97 
0.58 
[1.97] 
0.90 
3.68 
0.94 
1.59 
0-71 
28 
1-81 
2-43 
2-07 
3.56 
Ml 
1.64 
115 
1.24 
[2.67] 
1-29 
1.47 
[1.45] 
29 
4-14 
1-89 
1-08 
0.85 
[1-32] 
1.02 
4-43 
1.79 
1.01 
2.57 
1-89 
30 
1-77 
[1.55] 
1-73 
216 
2.00 
0.93 
3-78 
1.62 
1.03 
[2.21] 
2.17 
31 
M8 
Ml 
4.I6 
1-00 
[2.88] 
2-05 
2.05 
TABLE XII. — Mean Difference of a Single Observation of the Magnetic Declination from the Monthly 
Mean at the corresponding Hour, with reference to the Moon's Age and Declination, for 1845. 
After 
After 
Moon's 
Mean 
Moon's 
Mean 
Moon 
Mean 
Moon 
Mean 
Age. 
Difference. 
Age. 
Difference. 
farthest 
Difference. 
farthest 
Difference. 
North. 
North. 
Day. 
Day. 
Day. 
Day. 
1.55 
15 
1.57 
0 
1-57 
0 
1-38 
14 
16 
1-72 
1 
1-78 
1 
1.71 
15 
1.38 
17 
1.61 
2 
1-72 
2 
1.89 
16 
1.44 
18 
2.03 
3 
134 
3 
2.33 
17 
2-32 
19 
1.84 
4 
1.82 
4 
1.79 
18 
1.73 
20 
2-02 
5 
1.62 
5 
2.09 
19 
1.62 
21 
2.28 
6 
1.67 
6 
1.80 
20 
1-40 
22 
1.69 
7 
1.44 
7 
1.93 
21 
1.29 
23 
1.40 
8 
2-11 
8 
2.01 
22 
1.57 
24 
1.87 
9 
1-66 
9 
1-90 
23 
1.81 
25 
1-78 
10 
1-32 
10 
1.90 
24 
1.22 
26 
1.84 
11 
1-40 
11 
1.57 
25 
1-44 
27 
1.69 
12 
1-75 
12 
1.48 
26 
1.43 
28 
1.75 
13 
1-47 
13 
1.85 
27 
1-48 
29 
1.65 
14 
1-48 
