OP THE MAGNETIC DECLINATION. 
505 
Table I. — Lunar-diurnal Variation of the Magnetic Declination (1858-1863). 
1st. From the superior to the inferior passage. 
Declination of the 
Lunar hours. 
| Sun. 
Moon. 
0. 
L 
2. j 3. 
4. 
5. 
6. 
! 7 - 
8. 
9. 
10. 
11. 
S. and N. 
S. and N. 
+ 6-38 
+ 7-84 
+ 5-13 
- 0-89 
- 5-86 
- 9-23 
-11-74 
— 12 10 
- 9 04 
- 2-06 
+ 6J6 
+ 10-31 | 
S. 
+ 1318 
+ 16-33 
+ 10-20 
+ 115 
-1004 
— 15-96 
-20-64 
— 15-55 
-10-32 
- 0-90 
+ 10-61 
+ 12-67 1 
N. 
- 179 
- 1-98 
- 0-82 
- 3-30 
- 100 
- 1-43 
- 1-61 
- 812 
— 7-60 
- 3 39 
+ 105 
+ 7-54 : 
S.andN. 
S. 
+ 9 08 
+ 9-35 
+ 7-48 
- 0-29 
- 8-23 
- 8 62 
-12-87 
- 7 35 
- 631 
+ 4-36 
+ 909 
+ 9-74 i 
S. 
+1773, 
+ 18-01 
+ 13-64 
+ 1-91 
-14-39 
-1808 
-2418 
-13-14 
- 7-97 
+ 8-85 
+ 15-94 
+ 1227 1 
N. 
— 1-68 
- 0-93 
+ 002 
- 3-08 
- 0-77 
+ 305 
+ 0-67 
- 0-33 
- 4-29 
- 100 
+ 102 
+ 6-71 
S. and N. 
N. 
+ 372 
+ 6-33 
+ 2 78 
- 1-50 
- 3-44 
- 9-83 
-10-62 
-1676 
-11-83 
- 8-46 
+ 3 24 
+10-88 
S. 
+ 8-56 
+14-62 
+ 6-67 
+ 0-33 
- 5-43 
-13-64 
-16-96 
-18 02 
-12-87 
-10-96 
+ 5-17 
+13-07 
N. 
” 
- 1-90 
- 301 
- 1-64 
- 3-50 
- 122 
- 5-72 
- 376 
-15-36 
-1074 
- 5-68 
+ 109 
-J- 8*36 | 
2nd. From the inferior to the superior passage. 
Declination of the 
Lunar 
hours. 
Sun. 
Moon. 
12. 
13. 
„ j ,, 
16. 
17. 
18. 
19. 20. 
21. 
22. 
23. 
S. and N. 
S. and N. 
+ 1138 
+ 10-38 
+ 7-01 
+ 2-43 
- 4-33 
- 7-42 
- 6-89 
- 7-83 - 8 03 
- 515 
+ 313 
+ 6-25 
S. 
+ 17-45 
+ 16 55 
+ 10-25 
+ 2-29 
— 4-06 
-12 82 
-12-86 
-1718 -12-25 
- 4-23 
+ 512 
+ 1071 
N. 
,, 
+ 4-33 
+ 3-24 
+ 3-30 
+ 2-60 
- 4-64 
- 1-26 
+ 0 37 
+ 3 07 - 3 01 
- 6 27 
+ 0-80 
+ 1-04 
S. and N. 
S. 
+ 8-67 
+ 4-33 
+ 4-84 
+ 1-92 
- 3-28 
- 4-54 
- 701 
— 8-46 - 7-53 
- 5-80 
+ 1-73 
+ 7‘6 5 1 
S. 
+ 1519 
+ 9-42 
+ 5-83 
+ 1-62 
+ 0-97 
- 5 58 
-13 03 
—21-11 I -13-29 
— 5-25 
+ 4-28 
+ 13 14 
X. 
+ 1-20 
- 1-68 
+ 3-69 
+ 2-27 
- 8-20 
- 3-33 
000 
+ 6-24 | - 0-56 
- 6-48 
- 1 39 
+ 0-96 i 
S. and N. 
N. 
+ 1410 
+ 16-64 
+ 9-20 
+ 2-96 
— 5-42 
-10-36 
- 6-35 
- 7-19 - 8-55 
- 4-51 
+ 4 51 
+ 4-84 
S. 
+ 1973 
+24-06 
+ 14-81 
+ 2-99 
- 9 28 
-20 35 
-12-68 
-13-27 -1118 
- 3-20 
+ 5-98 
+ 8-17 
N. 
+ 7-52 
+ 8 22 
+ 2-98 
+ 2-92 
- 0-96 
+ 0-83 
+ 075 
— 0 09 - 5-45 
- 6 06 
+ 2'86 
+ 112 
Group I. : — Declination of the moon south and north , i. e. no distinction being made 
with reference to the moon’s declination. 
1. No distinction with reference to the sun’s declination (this may be called the 
mean yearly curve). 
2. The sun’s declination south (summer half-yearly curve). 
3. The sun’s declination north (winter half-yearly curve). 
Group II. : — Declination of the moon south. 
1. No distinction with reference to the sun’s declination (yearly south curve). 
2. The sun’s declination south (the summer half-yearly south curve). 
3. The sun’s declination north (winter half-yearly south curve). 
Group III. : — Declination of the moon north. 
1. No distinction with reference to the sun’s declination (yearly north curve). 
2. The sun’s declination south (summer half-yearly north curve). 
3. The sun’s declination north (winter half-yearly north curve). 
A glance at the curves of Plate I. shows that the lunar-diurnal variation must be 
regarded as being influenced by both the sun and the moon, for we perceive that, in 
case the declinations of both heavenly bodies are of the same name, both north or both 
south, the curves show greater regularity than they exhibit otherwise. For instance : 
the summer half-yearly south curve is far less irregular than the summer 'half-yearly 
3 t 2 
