The Auroea Bokealis. 
Ixxv 
167- Motions with reference to the Mooii's Hour-Angle. — These, as obtained from the means of all the luna- 
tions in the years 1844 and 1845, and as deduced from winter lunations for 1845 only, are shewn in 
Plate VII. The resulting figures, especially that for the winter lunations of 1845, bear some resemblance to 
the diurnal motion for the month of December. 
The Aurora Borealis. 
168. The results for the aurora borealis are placed between the magnetical and meteorological discussions, 
because the appearances of this meteor are distinctly connected with magnetic disturbances ; the frequency of 
the one and the magnitude of the other, it vaW be seen, are governed by the same laws. 
169. The following Table contains a list of all the auroree seen at Makerstoun, between January 1843 and 
June 1849. A very careful outlook for auroras was kept throughout the whole period, but especially during 
the first five years ; an outlook warned by magnetic disturbance in circumstances unfavourable to the visibility 
of the meteor, and assisted by a practical acquaintance with the faintest auroral indications. In several cases, 
the auroral appearances were very faint ; these are entered in the Table as " Traces," and, in others, there was 
doubt whether the appearance was truly auroral ; these are indicated by " Trace V It should be noted that, 
with the exception of the years 1844 and 1845, aurorse were seldom looked for after midnight. 
Table 69. — List of Aurorse Boreales seen at Makerstoun in the years 1843-9. 
Date, 
Gbttingen 
Mean Time. 
Moon's 
Age. 
Sky 
Dlouded. 
Species 
of Clouds. 
OnaractGr 
of Magnetic 
Disturbance. 
d. h.- 
h. 
<J. 
Jan. 28 8 
28 
00 
Slight 
Feb. 24 10— 
13 
25 
9-7 
Scud 
Moderate 
Mar. 6 14 
5 
20 
Cum.-scud 
Moderate 
7 8 
6 
0-0 
Moderate 
1 2 9 — 
•13 
11 
2-0 
Scud 
Considerable 
29 9— 
■12 
28 
0-0 
Moderate 
Apr. 5 9— 
•14 
6 
00 
Considerable 
6 14— 
-16 
7 
00 
Considerable 
Sept. 18 10— 
-12 
24 
2-5 
\^ LL l.\J a \jX • 
Moderate 
19 10 
25 
9-8 
Cirrous 
Moderate 
20 14— 
-15 
26 
1-0 
Scud 
Oct. 15 10 
21 
16 10 
22 
9-8 
Cirrous 
Slight 
26 8— 
-10 
3 
0-5 
Loose cum. 
Moderate 
Nov. 2 10 
10 
0-2 
Slight 
13 8- 
-10 
21 
9-8 
Various 
Slight 
14 10 
22 
8-0 
Cir.-strati 
Slight 
Dec. 11 10 
19 
50 
Sc. ; cir.-str. 
Moderate 
12 8 
20 
10-0 
Scud 
Moderate 
27 6 
6 
0-8 
Scud 
SHght 
1844. 
Jan. 5 10 
15 
90 
Scud 
Moderate 
10 10- 
-11 
20 
2-0 
Cirri 
IModerate 
Feb. 7 9 
19 
0-5 
Loose scud 
Moderate 
11 13- 
-14 
23 
5-5 
Cirri 
Slight 
22 8 
4 
50 
Cirri 
Slight 
Mar. 2 9 
13 
1-0 
Scud; cir. 
Moderate 
7 8- 
-10 
18 
1-0 
Cir.-str. 
Moderate 
9 13 
20 
2-0 
Sc. ; cirri 
Moderate 
12 11 
23 
01 
Cirri 
Slight 
29 11- 
-16 
12 
0-1 
Cirri 
Moderate 
Apr. 5 12- 
-14 
19 
0-2 
Cir.-str. 
Moderate 
10 13 
23 
0-9 
Cir.-str. 
Slight 
17 11- 
-12 
0 
5-0 
Cirri 
Considerable 
May 8 11- 
-12 
21 
1-2 
Cirri 
Moderate 
General Remarks. 
Traces. (Seen at Christiania.) 
Traces. (Seen at Christiania and in United States.) 
Seen through clouds. 
Arch 10° altitude. 
Distiact. 
Segment of circle 15° alt. lOI *", equatorial beam. 
Bright arches and streamers. 
14'' ; arch 10° broad, 15° altitude. Corruscations. 
Bright. 14'^ 35" ; 12° altitude. 
ll''; band 10° altitude ; seen through clouds. 
Traces. (Seen at Christiania.) 
Auroral arch 15° altitude. Streamers. 
Traces through clouds. 
50™ ; arch 8° altitude. 
Traces. 
Distinct. [places. 
Traces. 12'' ; magnets slightly disturbed at other 
Distinct. 
Traces; through clouds. (Appearances at Parma.) 
Traces. 
Traces. 
Traces. 
Faint. 
Traces. (Suspected at New Haven, Connecticut.) 
Traces. 
Trace. (Bright moonlight.) 
Rather bright. Arch and streamers. 
Rather bright. 
Faint. 
Bright. Arches and streamers. 
Streamers, arch and band. 
Traces. 
Faint streamers and homogeneous light. 
Faint. 
of Refer- 
ence. 
(1843.) 
93 
201 
203 
54 
54 
111, 61 
61 
205 
213 
69 
69 
173 
175 
177 
70 
183 
183 
71 
191 
72 
(1844.) 
174 
175 
186 
187 
158 
158 
158 
158 
158 
158 
158 
209 
158 
158 
MAG. AND MET. OBS. 1845 AND 1846. 
