•f JJt ) 
Height, as I cannot but imagine from this Circum* 
ftance, that they never appear, any of -them, according 
to the beft of my Obfervation, where the Sky is cloudy ^ 
and therefore, in all Probability, their Explofion is in 
the Regions far above the Clouds, and they themfelves 
of the fame Nature with (tho* perhaps lels, and much 
lower than) that great Meteor above-mention*d, whofe 
Height Dr. Halley computes to have been above 6o Geo- 
graphical Miles, *viz>. much above the (’till then) re- 
puted Limits of our Atmofphere. But fuppofing thefe 
I mention to be difcharged only at 20 or 30 Miles 
high, they may be feen by different Obfervers at the 
fame Moment of abfolute Time, in very diftant Places 
from one another, which is the Thing required: For, 
if in any Two Places, as the Dodlor takes Notice, any 
Two Obfervers, by Help of Pendulum Clocks duly 
correded by celeftial Obfervations, do exadly note at 
what Hour, Minute, and Second, fuch a Meteor is dif- 
charged, the Difference of thofe Times will be the 
Difference of Longitude of the Two Places , nor does 
it require fo much as the Ufe of a Telefcope, as in the 
Methods hitherto put in Pradice for that Purpofe. 
Now thefe natural Rockets I have found to be very 
frequent in every Star-light Night , but efpecially af- 
ter a ftorniy Day, or in a ftormy Night, If, therefore, 
Perfons who are prepared, as above, to be exad in their 
Time,, and alfo have a moderate Knowledge of the fe- 
veral Conftellations, fo as to defcribe the Track of any 
of thofe Meteors amongft the Stars,, would but beftow 
any determinate Hour to be agreed amongft them, as 
for Inftance, from 8 to 9 each fuch Night, to watch 
and obferve thofe Explofions, noting down immediately 
the Time and Track of them, it would be eafy to de- 
termine^ 
