146 On the Meteors of 12th November, 1833. 



But applying to the same figure, the elements as deduced from the 

 observations made at New Haven and Worthington, the calculation 

 will be as follows. 



BCD=71° 26' Sin 1° 30' - - 8.417919 



ADC= 1° 30' Sin 71° 26' - - 9.976787 



AC= 85.1 85.1 - - 1.929930 



11.906717 



3082 - - 3.488798 



From this calculation we obtain for the distance from New Haven 

 to the place of the Meteors, three thousand eighty-two miles, a result 

 nearly twice as great as the former. I know of no way of account- 

 ing for this difference, but to impute it to want of exactness in obser- 

 vations made loosely with the naked eye, instead of being measured 

 by instruments. 



Referring the same estimates to the center of the earth, we obtain 

 the following results. 



AB=1657 AC=3956.\AB+AC=5613 3.749195 



AB- AC =2299 3.361539 



BAC = 180°-21° 18'= 158° 42' 



tan 10° 39' 9.274269 



£ABC-f4BCA= 10° 39' 12.635803 



tan 4° 25' 8.886613 

 ABC = 15° 4' 



ACB= 6° 14' 



Sin 15° 4' - 9.414878 



Sin 21° 18' - - - 9.560207 



3956 - - - 3.597256 



13.157463 



BC=5528 - - - 3.742585 



DB=1572 



Hence, according to the observations made at Emmittsburg and 

 New Haven, the perpendicular height, above the surface of the earth, 

 of the place whence the meteors emanated, was fifteen hundred and 

 seventy-two miles. But from the observations made at Worthington 

 and New Haven, the perpendicular height, estimated in the same 

 way, was 2955 miles. 



We have at present no more satisfactory way of obtaining the per- 

 pendicular height of the place in question, than to take the mean of 



