420 
THE ASTRONOMER ROYAL ON THE DIURNAL AND ANNUAL 
Days of Lunation. 
Inequality in Declination. 
Inequality in 
Horizontal Force. 
22 
-0*13 
+ 0-00016 
23 
—0-18 
+ 
11 
24 
-0-18 
+ 
8 
25 
-0-15 
+ 
6 
26 
—0-12 
0 
27 
—0-04 
- 
4 
28 
+0-04 
- 
3 
29 
+0-11 
- 
6 
LUNO-DIURNAL INEQUALITIES IN THE HORIZONTAL PLANE. 
The Luno-diurnal inequalities were found in the same way as the Solar Diurnal 
inequalities ; and the results are the following : — 
The annual means from 1848 to 1857 are printed in the Greenwich Magnetical and 
Meteorological Observations, 1859, pages ccxxv and ccxxxi ; and it is unnecessary to 
repeat them here. Those from 1858 to 1863 are contained in the following Tables: — 
Lunar 
Hour. 
Luno-diurnal Inequality in Western Declination. 
1858. 
1859. 
1860. 
1861. 
1862. 
1863. 
Mean, 
1858-1863. 
Equivalent in 
terms of 
Horizontal Force. 
0 
+6-1 
+ 6-3 
+ 6-5 
+ 6-1 
+6-i 
*+6-4 
+ 6-25 
+ 0-000073 
1 
o-o 
+ 0-3 
+ 0-5 
+ 0-1 
+ 0-1 
+ 0-4 
+ 0-23 
+ 
67 
2 
+ 0-1 
+ 0-4 
+ 0-4 
+ 0-1 
+ 0-3 
+ 0-3 
+ 0-27 
+ 
79 
3 
0-0 
+ 0-4 
+ 0*2 
+ 0-3 
+ 0-2 
+ 0-1 
+ 0-20 
+ 
58 
4 
-0-2 
+ 0-4 
+ 0-2 
+ 0-1 
+ 0-2 
0-0 
+ 0-12 
+ 
35 
5 
-0*2 
+ 0-2 
0-0 
+ 0-1 
-0-1 
-0-1 
-0-02 
— 
6 
6 
-0-2 
+ 0-2 
-0-3 
0-0 
-0-1 
-0-3 
-0-12 
— 
35 
7 
-0-1 
0-0 
-0-4 
-0-3 
-0-2 
-0-5 
-0-25 
— 
73 
8 
-0-1 
-0-1 
-0-4 
0-0 
-0-3 
-0-5 
-0-23 
— 
67 
9 
+ 0-1 
-0-1 
-01 
+ 0-4 
-0-3 
-0-4 
-0-07 
— 
20 
10 
+ 0-2 
0-0 
-0-1 
+ 0-3 
0-0 
— 0-2 
+ 0-03 
+ 
9 
11 
+ 0-1 
+ 0-1 
-0*1 
+ 0-4 
+ 0-2 
-0-2 
+ 0-08 
+ 
23 
12 
+ 0*1 
+ 0-3 
+ 0-3 
+ 0-3 
+ 0-4 
+ 0-2 
+ 0-27 
+ 
79 
13 
+ 0-2 
+ 0-2 
+ 0-3 
+ 0-2 
+ 0-3 
+ 0-1 
+ 0-22 
+ 
64 
14 
-0-1 
+ 0-1 
+ 0-3 
+ 0-2 
+ 0-2 
+ 0-1 
+ 0-13 
+ 
38 
15 
0-0 
+ 0-1 
+ 0-1 
0-0 
+ 0-2 
+ 0-1 
+ 0-08 
+ 
23 
16 
0-0 
-0-2 
-0-2 
-0-3 
+ 0-1 
4-0-3 
-0-05 
— 
15 
17 
-0-2 
-0-3 
-0-3 
-0-3 
0-0 
+ 0-1 
-0-17 
— 
49 
18 
-0*1 
-0-5 
-0-5 
-0-3 
-0-3 
0-0 
-0-28 
— 
81 
19 
0-0 
-0-6 
-0-3 
-0-5 
-0-3 
-0-2 
-0*32 
— 
93 
20 
+ 0-1 
-0-7 
-0-3 
-0-4 
-0-5 
-0-2 
-0-33 
— 
96 
21 
+ 0-2 
-0-5 
-0-2 
-0-4 
-0-3 
-0-2 
-0-23 
— 
67 
22 
+ 0-1 
-0-4 
+ 0-2 
-0-3 
-0-1 
+ 0-2 
-0-05 
— 
15 
23 
1 
+ 0-1 
0-0 
+ 0-2 
-0-1 
+ 0-2 
+ 0-3 
+ 0-12 
+ 
35 
