of the meteor of 1807. : 231 
rauth of the meteor at the time of its disappearance was 172° or 173°, 
being about 2° greater than by the preceding calculations ;. and it 
seems reasonable to make the same allowance on the first azimuth, 
observed at Rutland. This correction being made, the azimuths be- 
come 168° 30’ and 170° 30’ and the altitudes 18° 27’ and 5° 45, cor- 
responding respectively to the first and last observations at Rutland. 
The azimuth corresponding to any intermediate altitude, may be 
found sufficiently near by supposing the variations of altitude and 
azimuth to be proportional to each other. In this way the azimuths 
corresponding to the altitudes. 6°30’ and 7° 30’* would be respectively 
170° 23’ and.170°14'; which are rather less than the azimuths made use 
of in examples 1Land 7. ‘The changes to be made in the results of 
these examples, for this small difference of azimuth, may be easily es- 
timated by comparing those examples with. the 12th, and 8th. Tn 
this way were found the assumed values, corresponding to those ex- 
amples, given in the right hand columns of Table I. By taking the 
mean of the assumed values in Table I, corresponding to the exam- 
ples 5, 6; and 7, 8; also the mean of those deduced from examples 
9, 10; and 11, 12; there will be obtained the altitudes, latitudes and 
longitudes of the meteor, marked in Table II, as the most probable 
values corresponding to the times of the first and second observations 
made at Wenham. 
At the first Rutland observation the meteor was not seen at Wen- 
ham, since the azimuth at Wenham at that time was probably less than 
84° (as appears by the four first examples of Table 1) and the first ob- 
served azimuth exceeded 106°; so that there can be no very accurate 
estimate of the situation of the meteor at that time. However, as the 
* These are nearly thé altitudes at Rutland grthetime of the two first obser- 
‘ations at Wenham, as appears by Examples 7,8; 11,12. An EOF of several 
minutes in these altitudes would hardly cause any sensible change in + geal 
ed azimuths at Rutland. 2 
