AURORA BOREALIS OF NOVEMBER 17, 1848. 627 



An anonymous observer at Darlington, states in the Durham Advertiser of Nov. 24, 1848, that 

 at Nov. 17, U*". 27™, which I suppose to be Darlington time, ^ Persei was exactly in the centre of 

 the Corona. The latitude of Darlington is 54°. 32', and the longitude 6". 12^ West. Hence I have 

 deduced. 



From observations of the Aurora of November 17, made at Lansdowne Crescent, Bath, by 

 H. Lawson, Esq., and E. J. Lowe, Esq. ; (1) " At iO*". 20". (Bath time), the Corona was situated at 

 21 Persei." (2) At ll'". 20". the centre of the Cupola was X, Persei." The assumed latitude of 

 Bath is 51°. 22', and the assumed longitude 9""- 28'. West ; and the results of calculation are 

 Z Z' Z~Z' M M- M - M' 



(1) 21°. 20' ^O". 36' +0°. 44' 8°. 28' 7°. 47' + 0°. 41' 



(2) 20 . 32 20 . 32 +0.0 5 . 41 8.9 - 2 . 28 

 Means 20 . 56 20 . 34 + . 22 7.5 7 . 58 - . 53 



A remarkable Aurora occurred on Oct. 18, 1848, which was not seen at Cambridge, on account 

 of clouds. A description of it was sent to me by J. F. Miller, Esq., of Whitehaven. The most 

 precise observations of the position of the Corona contained in the account are the following : — 



(l). " lO*". 7". G. M. T., the centre of the Corona is about 5° above a Andromeda;, and nearly 

 in a line with -y Pegasi." It had consequently nearly the same Right Ascension as a Andromeda;. 



(2). '■ 10*". 24". G. M. T. The whole hemisphere is covered with streamers converging around 

 TT Andromedae." 



(3). " lO*". 52™. G. M. T. /3 or m Andromedae, appears to be the centre of convergence." I 

 have taken the mean position between the two stars. 



(4). "11*'. 17". G. M. T. I have watched the Corona very attentively some time, and I 

 think /3 Andromedae as nearly as possible marks its centre." 



(5). " ll''. 37". G. M. T. The coronal centre seems now to be about mid-way between y 

 Andromedfe, and /3 Trianguli." 



I have compared these observations with the mean Magnetic Declination and Dip, deduced 

 from those of Greenwich, which for Oct. IS, are assumed to be 22°. 53', and 68°. 55'. The latitude 

 of Whitehaven is 54". 33', and the longitude 14™. 12'. West. The following are the results of the 

 calculations. 



In the instance of tile Aurora Borcalis of Oct. 24, 1847, I observed that at lo''. 10'"., Cambridge 

 Mean Time, the centre of the Corona was at a point of less U. A. than /J Andronicdiv by H)"', and 

 of greater N. P. D. by 2". I am able to compare this observation with the actual Dccliniition and 

 Dip at the noted time, by means of Greenwich Magnetical Observations inserted in tlie published 

 account of this Aurora drawti up by Mr. Morgan and Mr. Barber. From these data I find that 

 the Declination at Cambridge was 23". 5', and the Dip 69". 24'. Hence the result of tlie com- 

 parison is, 



On this occasion the Auroral light descended but a few degrees soutiiward of the Corona, .uid the 



