AURORAS OBSERVED AT- CAMBRIDGE. 



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ing slowly westward, and also small drifting 

 spots of bright light near the horizon. At 

 9 h 16 m , the illumination extended from the 

 northern horizon up to 30° of altitude. At 

 11" 36 m , the Aurora was shining brightly. 



Dec. 21. Faint* traces of Aurora, at ll h 30 m . 

 " 24. At 6 h 36™, delicate shoots of Aurora 

 were visible nearly up to the zenith. At 6 h 

 46 m , the Aurora disappeared near Capella, 

 but grew brighter in the zenith. At 6" 4S m , it 

 disappeared from the zenith, and shone again 

 in Auriga. At 6 h 52 m , no trace of the Aurora 

 could be seen. The magnetometers were dis- 

 turbed. 



1S42. 



Jan. 4. Between 6 h 21 m and 6 h 51 m , an Aurora 

 was seen in the northeast and northwest. 



" 5. About 6 h 36 m , au auroral arch was 

 visible in the northeast, at the altitude of 8° ; 

 but it soon died away. 



" 7. At 10 h 20 ra , an arch of Aurora, 12° 

 high, was seen in the north, northwest. The 

 same arch, with another resting upon it, at an 

 altitude of 20°, was visible at 10 h 10 m : at 10 h 

 40'"\ the upper arch was partly broken : at 10 h 

 45 m , a similar appearance was presented in the 

 southeast. In both these arches, stars were 

 visible, though not elsewhere, as it was cloudy. 

 " 9. At 9 h 21 m , a light appeared, shining 

 through the clouds in the north. 



" 11. Aurora Borealis at midnight, height 

 5° to 7°, bright, with wane clouds. 



" 12. Faint Aurora Borealis, with cirri 

 and wane, at 6 h 30 m . 



" 15. Aurora Borealis, strong, well defined 

 arch at 9 h . At 12 h , diffused light, low, at north 



Jan. 15. A diffused arch was visible in the 

 northwest, whose apex was from 10° to 12° 

 high. At 9* 26 m , the arch was bright. 



Feb. 11. Aurora low (3°), diffused, brighter on 

 the easterly part, at 7 h P. M. 



Feb. 11. A slight Aurora was observed. 



Mar. 23. Aurora. P. M. 



Apr. 10. Aurora, bright and steady, height 

 about 3°, at 9 h . 



" 12. Auroral arch, bright, steady, altitude 

 of apex from 7° to 10°. 



Aug. 8. At 2 h 36 rc , an auroral light was seen 

 in the north. 



Sept. 28. Aurora, low and diffused, with wane 

 at north. 



Nov. 21. Bright Aurora. 



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Nov. 28. Aurora low in north, at ll h P. M. 

 Dec. 27. Aurora among broken clouds, at 10 h 

 15 m P. M. 



1843. 



Aug. 3. Strong and lively Aurora, with merry 



dancers, at 10" P. M. 



Sept. 27. Bright auroral arch, apex 5° N. by E. 

 Oct. 14. Strong auroral arch 5°, apex north, 



at 6 h 30 ra . More diffused at 7 h . 

 Nov. 15. Slight Aurora at 5 h A. M. 



1844 

 Mar. 25. Aurora. 

 April 5. A well defined auroral arch at 9 h , a 



very rare phenomenon of late, altitude of apex 



3° to 5°, bore north by 5° E. at 10". 



" 17. Aurora, low at north with wane. 

 May 7. Northern Lights and merry dancers, 



at 10" P. M. 

 " 8. Aurora again, low, at 9>> P. M. 

 Oct. 20. Bright auroral arch, apex due north, 



altitude about 4°. 

 Dec. 14. Aurora. 



1845. 

 Jan. 9. Brilliant Aurora. 

 April 13. Masses of northern light at 10". 



" 30. Auroral light through clouds. 

 Sept. 24. Northern light. 



" 25. Aurora. 

 Oct. 21. Strong auroral light. 

 Dec. 3. Aurora. 



" 5. Aurora, low and diffused. 



1846. 



Jan. 28. Very strong Aurora, apex E. of N. 

 3°, altitude 10°. 



Feb. 26. Aurora dancing. 



Apr. 15. Northern Lights 10°, brightest in 

 N. E., shooters. 

 " 16. Aurora. 



May 4. Aurora shooting, faint. 



July 14. Northern Lights. ' 



Aug. 11. Bright Aurora, with streamers, 8"-9". 

 " 24. Splendid Aurora. 



Sept. 10. Auroral light formed at 8" P. M. an 

 arch of 10° in breadth, to the N. E. The 

 interior of the arch was darker, or a deeper 

 blue, than the rest of the sky, the lower edge of 

 the arch cut a Ursa; Majoris on the west, and 

 a Persei to the eastward. At 8" 20 m , it was 

 quite bright at times, masses of cloudy light. 

 It faded rather suddenly, and the peculiar wane 



