[ 76 ] 

 MR. Squire's comparative observations of the solar 



ECLIPSE OF NOV. 29, 1826. 



To the Editors of the Philosophical Magazine and Annals. 

 Gentlemen, 



In No. I. of the New Series of the Philosophical Magazine and 

 Annals, you were so good as to insert my observations of the solar 

 eclipse of November last ; but having now the Greenwich observa- 

 tions of the end of this eclipse, and being desirousof comparing the 

 observations taken at the two places, I have for this purpose made a 

 computation of the end at this place, and by which I find that my 

 observation agrees so well with the mean of those taken at Green- 

 wich, that I am induced to trouble you with the results. In calcu- 

 lating the end for Epping, (latitude 51° 41' 41 "-6, longitude 27 se- 

 conds E. of Greenwich,) I have taken into consideration the sphe- 

 roidical figure of the earth, and applied every other correction that 

 the present refined state of astronomy requires, the same as was 

 done iia the computations for Greenwich. 



In the following summary of the calculations and observations, 

 the instants are given in mean solar time, according to the meri- 

 dian of the Royal Observatory. 



End ofthe eclipse at Epping, by calculation, Nov. 29'' 0^ 0" IP-T't 

 Ditto at Greenwich by ditto 28 23 59 58 -S* 



Difference 12-9 



End at Epping, by observation 29'' 0*" O" 27' 



Ditto at Greenwich by ditto 29 14- -55 



Difference 12-45 



Hence it appears that, owing to the effects of the lunar parallax, 

 the termination of this eclipse at Epping was absolutely later than 

 at Greenwich by 12'9 seconds in the former case, and 12'45 in the 

 latter, making a second difference of only 45 of a second between 

 the computed and observed times at the two places ; a nearer ap- 

 proximation could hardly have been expected. 

 Again, 



f Observed time of the end. . 29" O*" 0™ 27* 

 Calculated time of ditto . . 29 1 1 -74 

 

 Difference 15-26 



^-Observed time of the end . . 29'' O"" 0"* 14''-55 

 I Calculated time of ditto . . 28 23 59 58 -84 

 Greenwich i 



Difference 15 71 



From which it appears that the observed time at Epping was later 



than 



