418 
THE ASTRONOMER ROYAL ON THE DIURNAL AND ANNUAL 
Hours of nodal passages. 
Period 1848-1857. Period 1858-1863. 
h 
m 
h 
m 
h 
m 
h 
m 
January 
4 
0 
16 
0 
4 
25 
17 
25 
February 
4 
0 
15 
20 
4 
50 
17 
30 
March 
4 
0 
15 
25 
4 
55 
16 
40 
April 
3 
20 
14 
30 
5 
0 
16 
40 
May 
1 
25 
13 
45 
3 
0 
14 
50 
June 
1 
20 
13 
20 
4 
40 
16 
0 
July 
1 
30 
13 
45 
2 
50 
15 
30 
August 
2 
10 
13 
35 
2 
30 
14 
40 
September 
2 
45 
14 
15 
3 
20 
16 
0 
October 
3 
35 
15 
50 
4 
25 
16 
25 
November 
4 
10 
15 
45 
4 
50 
17 
15 
December 
4 
40 
15 
30 
5 
15 
18 
0 
The differences are probably connected with those which I have next to exhibit. 
On comparing the annual curves for Vertical Force, it appears that to the year 1855 
they gradually increased in boldness, and that from that year to 1862 (Plate XXXVI.) 
they have gradually diminished. The times of passage of node in the annual curves merit 
examination. In -the former paper I pointed out a remarkable change which appeared 
to have gone on from 1842 to 1857. I will now bring together the nodal hours, all 
referred to Greenwich Time, for the entire period. 
Hours of nodal passage, 
h m h m 
1842 8 40 20 30 
1843 9 50 23 40 
1844 10 40 24 5 
1845 9 35 24 0 
1846 11 20 23 40 
1847 8 40 19 20 
1848 No observations. 
1849 6 20 14 30 
1850 4 10 14 40 
1851 3 10 13 35 
1852 3 25 14 15 
1853 3 15 15 20 
1854 3 30 15 15 
1855 2 50 14 20 
1856 3 20 14 55 
1857 2 30 13 50 
1858 2 10 13 35 
1859 4 0 15 45 
1860 4 50 17 25 
1861 4 20 16 20 
1862 3 45 15 35 
1863 5 25 17 35 
It appears here that there is a rude relation between 
the hours of nodal passage of 
