of the meteor of 1807. 229 
calculations are repeated with the second Wenham azimuth and alti- 
tude. In the 13th. example, the azimuth and altitude at Weston at 
the time of the disappearance of the meteor, are combined with the 
altitude at Wenham, supposing it 5°: in the three following exam-— 
ples the calculation is repeated with small variations in the values of 
the given quantities. The azimuths at Wenham, calculated in the 
13th. and 14th. examples, are made use of in the 17th. 18th.and 19th. 
with the corresponding assumed altitudes at Wenham, and the azi- 
muth at Rutland at the time of the disappearance of the meteor, sup- 
posing it to be N 172° W in the 17th. and 18th. examples, and N 
170° 30’ W in the 19th, 
It appears by this table, that in the 5th. and 6th. aman the al- 
titude of the meteor at Weston was about 16° 30, and in the 9th. and 
- 10th. about 36°. Now if the meteor appeared at Weston to describe 
a great circle, beginning at the north part of the horizon and terminat- 
ing at a point having the azimuth N 15° W and altitude 75° (which 
was nearly the case by the observations of Judge Wheeler) the azi-: 
muth corresponding to the altitudes 16°30’ and 36°, would be respec- 
tively 1° 11’ and 2° 53’, as is easily found by spherics. The places 
of the meteor corresponding nearly to the azimuths 1° 11’ and 2° 53’, 
are given in the three right hand columns of the table opposite to those 
examples; these quantities being found by proportion. Thus by 
the 5th. and 6th. examples, the latitudes corresponding to the azi- 
muths 0° and 3° are 42° 3’ 6” and 42° 2’ 15”, varying 51” by a change 
of 3° of azimuth; hence the latitude corresponding to the azimuth 
1°11’ js 42°9'46” or 42° 2’ 45”, asin the table. The other quantities 
were calculated in the same manner. The azimuth of the meteor at 
Wenham at the time of disappearing was not far from 123°30' or 124°, 
as is evident from examples 13, 14, 15 and 16. Mrs. Gardner sup- 
posed the meteor to have been visible considerably south of this 
29 
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