508 
DE. Gr. NEUMAYEE ON THE LTJNAE-DIUENAL VAEIATION 
notice also a marked difference between the curve when the moon is south of the equator 
(II.) and the one when her declination is north (III.). A glance at the diagrams will 
convince us of this ; we need only to point out that the range of oscillation in the first 
instance, taking both branches into consideration, is 27" - 35, in the last but 21"T8, and 
that the extremes occur in the latter case two hours earlier than in the former. Besides 
these differences there are others of minor import which also contribute towards drawing 
a distinction between the curves for north and south declinations of the moon ; for in- 
stance, the secondary extremes differ in the south curve by 24"'85, whilst the corre- 
sponding deviation in the north curve is but 13"*20. 
On examining the results of this inquiry for the several years of observation some- 
what closer, we are struck by the differences which they exhibit among themselves. It 
was the year 1861 which first called my attention to this fact by manifesting consider- 
able abnormities with respect to every one of the curves of the lunar-diurnal variation 
for the various seasons and positions of the moon. These irregularities are the more 
striking, as the year 1860 does not exhibit any such extraordinary deviations from the 
mean values for the several years, although also in this case the curve for the winter half- 
year shows some peculiarly interesting features (Plate XIX.). 
The subjoined Table gives the lunar-diurnal variation for the years 1860 and 1861, 
and Plate XIX. shows the respective curves. 
Table II. — Lunar-diurnal Variation of the Magnetic Declination for the years 1860 and 1861. 
1st. From the superior to the inferior passage. 
Declination of the 
Lunar hours. 
Sun. 
Moon. 
0. 
1. 1 
2 . 
3. 
4. 
! 5. 
6. 
7. 
8. 
9. 
10. 
1 11. 
7 
„ 
S. and N. 
S. and N. j 
I860 
+ 7-28 
+ 6-80 
+ 6-03 
+ 2-77 
- 3-90 
- 9-65 
— 8 09 
-14-91 
-14-45 
- 6-73 
+ 2-86 
+ 12-92 
1861 
1860 
- 5-87 
+ 11-54 
- 8-76 
+ 8-60 
- 6 82 
+ 10-37 
-13-38 
+ 3 oO 
- 9-69 1 
- 5-39 
- 8-96 
-11-70 
-12-88 
-2716 
-10-92 
-21 65 
- 610 
-24-92 
- 1 09 
- 7-52 
+ 6-84 
+ 2-04 
+ 17-21 
+ 6 50 
S. ( 
1861 
+ 4-18 
- 2-47 
- 1-96 
- 5-34 
-10-59 
— 6-69 
— 1 1-71 
+ 5-10 
+ 4-33 
+ 14 86 
+17 14 
+23-76 
N. { 
1860 
+ 3-56 
+ 5-21 
+ 2-14 
+ 2-08 
— 2-60 
- 7-79 
- 9 73 
- 8-47 
- 4-46 
- 5 98 
+ 3-67 
+ 18-92 
1 1861 
— 15-61 
-14-78 
-11-57 
-21-13 
- 8-72 1 
-11-37 
-14-03 
-25-98 
- 15-98 
— 15-91 
— 2 66 
+ 10 79 ! 
CJ 
S. and N. j 
I 1860 
+ 13-97 
+ 1391 
+ 9-88 
- 0-24 
-11-62 
—20-48 
-19 91 
-2307 
— 16-05 
— 4-06 
+ 9-47 
+ 17-84 
o. 
1 1861 
+ 3-64 
4- 1-74 
+ 5-61 
- 1-40 
-12-78 
-18-36 
-22-62 
-13-65 
- 3-32 
- 1-59 
+ 8-12 
+ 12-78 { 
N. 
1 
1860 
+ 2-08 
— 0 65 
+ 2-76 
+ 4-76 
+ 1-37 
I + 0-97 
- 3-97 
— 6-56 
-11-30 
— 10-56 
- 2-68 
+ 5-63 
” 1 
I 1861 
-17-98 
+19-65 
-19-96 
-25-84 | 
- 7 32 
| + 2-30 
- 1-07 
- 5-67 
- 5-95 
+ 0-12 
+ 4-50 
+ 17-76 
2nd. From the inferior to the superior passage. 
Declination of the 
Lunar 
hours. 
Sun. 
Moon. 
12. 
13. 
14. 
15. 
16. 
17. 
18. 
19. 
20. 
21. 
22. 
23 . 
Q anf l 'VT J 
I860 
+ 4-75 
+ 1-66 
+ 2 38 
- 0-85 
- f -42 
- 8 02 
+ 6-20 
- 5-07 
- 2-48 
+ 4-82 
+ 13-51 
+14-30 
io. anu . s 
1861 
+25 07 
+21-33 
+ 19-80 
+15-81 
+ 7-60 
+ 3-85 
- 5-35 
- 4-32 
-10-47 
— 1001 
- 3 01 
— 2-68 
r 
1860 
- 104 
- 9-18 
- 6-99 
- 6-31 
- 9-43 
-14-45 
+ 1-42 
-1217 
- 6 04 
- 0-31 
+ 12-47 
+ 19-40 I 
” 
S. j 
L 
1861 
+27-28 
+21-70 
+ 17-03 
+ 1134 
+ 7-91 
+ 8-37 
- 3-19 
- 2-25 
- 6-35 
- 3-24 
- 1-30 
+ 2-22 
j 
r 
1860 
+ 10-20 
+ 12-13 
+ 11-32 
+ 4-27 
+ 6-34 
- 2-01 
+ 11-08 
+ 1-79 
+ 0-82 
+ 9-53 
+ 14-43 
+ 9-48 | 
” 
"• 1 
l 
1861 
+22-79 
+2096 
+22 53 
+20-30 
+ 7-26 
- 0 79 
- 7 52 
- 6-21 
-14-56 
-16-38 
- 4-66 
- 7-49 
s. 
S. and N. \ 
r 
1860 
+ 14-93 
+ 12-92 
+ 12-34 
+ 1-98 
+ 5-91 
-14-15 
+ 1-45 
-17-46 
-12 16 
- 2-34 
+ 12-43 
+ 16-25 | 
i 
1861 
+24-34 
+ 20 26 
+ 17-67 
+ 12-90 
+ 1-49 
- 0-89 
-11 25 
— 12-61 
-15-87 
- 5-68 
+ 3-17 
+ 8-53 I 
N 
r 
1860 
- 4 06 
- 9-39 
- 8-19 
- 4-62 
- 8-51 
- 2-50 
+ 8-90 
+ 707 
+ 8-44 
+ 12-33 
+ 16-99 
+ 13-91 
” \ 
L 
1861 
+20-96 
+ 18 10 
+20-26 
+ 16-84 
+ 12-41 
+ 5-93 
+ 1-02 
+ 7-71 
— 6*64 
-16-16 
- 10-53 
-14-84 I 
