( 48 ) 
In order to determine the Orbit of this Comet, I 
fuppofed it to defcribe a Parabola agreeable to what 
is delivered in the third Book of Sir Ifaae Newton's 
Princip, Math . and then I found the Inclination of 
the Plains of the Orbit and Ecliptick 49 0 59'. The 
Place of the Afcending Node y 14 0 1 6 ! . The Place 
of the Perihelion « 12 0 52' 2o ;/ . The Diflance of 
the Per-ihelion from the Node 28° 36' 20 r/ . The 
Logarithm of the Perihelion diflance 9.999414. The 
Logarithm of the Diurnal Motion 9.96 1007. The 
Ti me of the Comets being in its Perihelion, Sept . 16 • 
i6 h ic' equal Time. In its Orbit thus fituated, the 
Motion of the Comet was Retrograde or contrary 
to the Order of the Signs. 
From thefe Elements, by the Help of Dr. Halleys 
general Table for Comets (to which they are adapted) 
1 computed the Places in the forgoing Table j which 
agreeing with the obferv’d Places as near as the Ob- 
servations themfelves agree with one another, fhew 
that it would be a vain Attempt to pretend to deter- 
mine the true Ellipfe in which this Comet moves, 
or its Periodical Revolution, from fo fmall a Part of 
its Orbit as that was, which it defcribed between the 
firfl and laft of the forgoing Obfervations j this there- 
fore muff be left to Poflerity, efpecially fince it is 
certain, that this Comet is not one of thofe of which 
Obfervations have hitherto been tranfmitted to us, 
fufficient to determine the Situation of their Orbits. 
The Nucleus of this Comet was very little, for it 
appear'd but of a fmall Diameter when I firfl faw it, 
although it was then above three times nearer to the 
Earth, than the Sun is at its mean Diflance. Its Tail 
was then hardly difcernable with the naked Eye, but 
through a Telefcope one might perceive a faint 
Light extending itfelf above a Degree from the Body. 
* I have 
