14 PHILOSOPHICAL TRANSACTIONS. [aNNO 1724. 



The night following Mr. Bradley observed it at Wansted ; when the result 

 of his observations showed that the comet's place was 307° & 'JO" of right as- 

 cension, and J 1° 8' 15" south declination. 



Oct. 12, and several niglus following, the comet was observed by Mr. B. 

 assisted by his uncle, the Rev. Mr. Pound ; and the results of their observa- 

 tions, together with those of Dr. Halley and Mr. Graham, were collected as 

 below, in the following table, which contains the longitudes and latitudes of 

 the comet deduced from the observations, together with the places of the 

 comet calculated from the theory of gravity, for the times of observation on 

 the several days, as also the differences between the observed and computed 

 places. Those differences, not exceeding one minute, show that the observa- 

 tions are not only consonant to each other, but that the places of the stars are 

 likewise near the truth, since the comet's places deduced from them are found 

 all along to agree sufficiently near with the theory of gravity ; the truth of 

 which has long since been established by its great author Sir Isaac Newton, and 

 by Dr. Halley. 



To determine the orbit of this comet, Mr. B. supposed it to describe a para- 

 bola, agreeable to what is delivered in the third book of Sir Isaac Newton's 

 Princip. Math, and then he found the inclination of the planes of the orbit and 

 ecliptic 49'^ 59': the place of the ascending node y 14" id': the place of the 

 perihelion y 12° 52' 20": the distance of the perihelion from the node 

 28" 36' 20 : the logarithm of the perihelion distance 9.999414 : the logarithm 

 of the diurnal motion 9.06 1 007 : the time of the comet's being in its perihelion, 

 Sept. 16'' 16'' 10™ equal time. In its orbit thus situated, the motion of the 

 comet was retrograde, or contrary to the order of the signs. 



