— eS 
: 
Tue AvRORA BOREALIS. lxxv 
167. Motions with reference to the Moon’s Howr-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 will be seen, are governed by the same laws. 
169. The following Table contains a list of all the aurore seen at Makerstoun, between January 1843 and 
June 1849. A very careful outlook for aurore 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?” It should be noted that, 
with the exception of the years 1844 and 1845, aurore were seldom looked for after midnight. 
TABLE 69.—List of Aurorz Boreales seen at Makerstoun in the years 1843-9. 
Dine, Moon’s| Sky Species SPREE BE eee 
Ottingen of Magnetic General Remarks. of Refer- 
eas Time. Age. |Clondad ios Clouds. Dictibancs, ence. 
“a eae a (1843.) 
Jan. 28- 8 28 0-0 Slight Traces. (Seen at Christiania.) 93 
Feb. 24 10—13| 25 9-7 | Seud Moderate Traces. (Seen at Christiania and in United States.)} 201 
Mar. 6 14 5 2-0 | Cum.-scud | Moderate Seen through clouds. 203 
7 8 6 0-0 Moderate Arch 10° altitude. 54 
12 9—13| 11 2-0 | Scud Considerable| Distinct. 54 
29 9—12| 28 0-0 Moderate Segment of circle 15° alt. 103", equatorial beam. | 111, 61 
Apr. 5 9—14 6 0-0 Considerable | Bright arches and streamers. 61 
6 14—16 7 0-0 Considerable} 145; arch 10° broad, 15° altitude. Corruscations. | 205 
Sept.18 10—12} 24 2-5 | Cirro-str. Moderate Bright. 145 35™; 12° altitude. 213 
19 10 25 9-8 | Cirrous Moderate 115; band 10° altitude ; seen through clouds. 69 
20 14—15| 26 1-0 | Scud Traces. (Seen at Christiania.) - 69 
Oct. 15 10 21 Auroral arch 15° altitude. Streamers. 173 
16 10 22 9-8 | Cirrous Slight Traces through clouds. 175 
26 8—10 3 0-5 | Loose cum. | Moderate 98 50™; arch 8° altitude. 177 
Noy. 2 10 10 0-2 Slight Traces. 70 
13 8—10| 21 9-8 | Various Slight Distinct. [places. | 183 
14 10 22 8-0 | Cir.-strati | Slight Traces. 124; magnets slightly disturbed at other | 183 
Dec. 11 10 19 5-0 | Sc.; cir.-str. | Moderate Distinct. 71 
12 8 20 | 10-0 | Scud Moderate Traces; through clouds, (Appearances at Parma.) | 191 
27 6 6 0-8 | Scud Slight Traces. 72 
1844. (1844.) 
Jan. 5 10 15 9:0 | Seud Moderate Traces. 174 
10 10—11| 20 2-0 | Cirri iModerate Traces. 175 
Feb. 7 9 19 0-5 | Loose scud | Moderate Faint. 186 
11 13—14| 23 5-5 | Cirri Slight Traces. (Suspected at New Haven, Connecticut.) | 187 
22 8 4 5-0 | Cirri Slight Traces. 158 
Mar. 2 9 13 1-0 | Scud; cir. | Moderate Trace. (Bright moonlight.) 158 
7 8—10; 18 1-0 | Cir.-str. Moderate Rather bright. Arch and streamers. 158 
9 13 20 2:0 | Sce.; cirri Moderate Rather bright. 158 
12 11 23 0-1 | Cirri Slight Faint. 158 
29 11—16| 12 0-1 | Cirri Moderate Bright. Arches and streamers. 158 
Apr. 5.12—14] 19 0-2 | Cir.-str. Moderate Streamers, arch and band. 158 
10 13 23 0-9 | Cir.-str. Slight Traces. 209 
17 11—12 0 5-0 | Cirri Considerable | Faint streamers and homogeneous light. 158 
May 8 11—12] 21 1-2 | Cirri Moderate Faint. 198 
MAG. AND MET. oS, 1845 anp 1846. t 
