( 9^1 ) 
Azimuth, without declining either to the Right or Left: 
Hence it is plain, that the Track likewife pafs’d over 
this place, which by our beO: Maps is found to lie in 
a Line with Frejiain and Kirbj-Stevem with Tufficienc 
Exatlnefs ; fo that we fhall take it for granted that 
this was the very Courfe it held. 
On this Suppofition, that the firfi: Explofion, at- 
tended with the reddilh Nuhecnla, was diredly over 
Tiverton^ we have the Oxford Obfervation to compare 
with it, in order to determine more nicely the per- 
pendicular Altitude there At Oxford this Nubecula 
W’as found to be 3 gr, above the middle Star of 0- 
rio»s Girdle^ at 8*^3', and was therefore gr, a- 
bove the Horizon ; and the Diftance between Oxford 
and Tiverton, being i°. or 115 Geographical Miles, 
it will be as the Sine of 61°. 35' to the Sine of 63° 30' 
So the Semidiameter of the Earth being 3437 r fuch 
Miles, to 3498 Miles the Diftance of the Meteor from 
the Center of the Earth ; from W'hich deduding the 
Semidiameter, there remains 60* Geographical Miles 
for the Height of the Meteor above Tiverton : And that 
this was fo is confirmed by the Obfervation of the 
Revc Mr. Will. Derham^ who at Windfor faw the afore- 
faid Nubecula about two Degrees above the moll Sou- 
therly of the Seven Stars in the Shield of Orion \ that 
is { the Time being 8*^6'^ in the Altitude of 13 \ gr* 
whence, the Diftance between Tiverton and Windfor 
being 150 meafured Miles, or 130 Geographical, by a 
like Proportion we fhall find the fame Height of the 
Meteor 60 fuch Miles wanting only one Quarter. So 
tliat in a round Number we may conclude it to have 
been juft 60 Geographic or 69 Statute Miles above 
the Earth’s Surface. Nor is it poftible to come at a 
precife Determination of this matter, by reafon of the 
Coarfenefs and Inaccuracy of our Data, which were 
