[ 11 * ]] . 
VII. A Collection of Obfervations commune 
cated to the Royal Society, relating to the 
Comet that appear d in the Months of 
January, February, and March 1736-7. 
1. Obfervations upon the Comet that appear d in 
the Months tf/ 7 January, February and March 1737, 
made at Oxford, by J. Bradley, F . R. $. Sav . 
Trof Aftron. 
I Made feveraF Obfervations on the late Comet, 
during the laft five Weeks of its Appearance^ 
which enabled me to find out the Elements of a pa- 
rabolic Traje&ory, upon which a Calculus might be 
founded, that would correfpond with each of my Ob- 
fervations within about a Minute of a Degree : But 
the firft of them being taken many Days after the 
Time of the Rerihelion , and the whole Series compre- 
hending but a very fmall Portion of the Trajectory 5 X 
was fenfible, that a little Error, either in the Obfer- 
vations themfelves, or in the Places of the Fixt Stars 
with which the Comet was compared, might occa- 
fion a confiderable Difference in the Situation and Mag- 
nitude, <£rc. of the Orbit deduced from them alone 5 
and therefore I was defirous of having feme earlier and 
accurate Obfervations, in order to determine thofe 
Elements with more Certainty : But not having yet 
been able to procure fuch, I fhali not longer defer lay- 
ing before the Society the Particulars of my own, to- 
gether with the Comparifon between the obferved 
Places 
