-T- -t. - . -^r i>- 



rjy ^ -r : ij-Va^ vj.^ 



■^■; ^ -r^- ^ ;^^^-.'^ ^^:"^ --J 



-i^v^f V_--_-^- -^ ---^^^■-■^■- 



y 



ASTRONOMICAL PAPERS, 



H5 



was again hid before I could take its diftancefrom the pole 

 R'dVy which feerned to be about 5 or 6 degrees. This even- 

 ing It was dillant from lucida lyrae 49^ 17'* whereas the 

 evening before it had been but 5®. 42' . from the fame ftarat 



gh. 



It had therefore moved above 45°.. in the laft 25 



hours, and now appeared much brighter than it had been 

 before; there being alfo fome' appearance of a tail on the 

 fide oppofite to the Sun. July the 2d it was cloudy with 

 rain in the evening; but in the morning of the 3d about 

 3". I obferved its diftance from the pole ftar, from Ca- 

 pella, and from a ftar of the fecond magnitude in Caffio- 

 peia, which was the laft time I faw it. 



From the above obfervatlons, and many very laborious 

 calculations, I have endeavoured to fettle the elements of 

 this comet's motions (fuppofing it to move in a parabola, 

 and to be governed by the Sun's attractive force) as follows,. 



•VIZ. 



The place of the afcendlng node - Leo 14°. 21'. 45 



The place of the perihelion 

 Inclination of the orbit - 



If 



- - rifccs26".i9'.28". 

 •■ - - I- 49'. 5". 



Perihelion diftancefrom the Sun, 



in fuch parts, as the earth's)^ ^^757sSLog-9-797<5653 

 mean diftance is 1 00000 _ 



~The logarithmof its dally mean motion « 0.2636300 

 Time of the comet's being in perihelio, Auguft 8th, 



19'V 26'. equal to Auguft 8. 80965 



Its motion dire<Sl; that is, according to the order of the 



figns. 



From thcfe elements, and Dr. Halleyh tabula gcncr alls 

 motuum cornet arum^ in orbe paraholico^ it will be eafy to 

 compute this comet's vifible place for any time; during 

 its ftay in the planetary regions^ in this manner. 



Find the difference between the time propofed and the 

 time of the perihelion; that is, Auguft 8. 80965, in days 

 and decimal parts of a day; and to the log. thereof add 

 the log. of the daily mean motion. The fum is the log. of, 

 the mean motion from the perihelion. To the mean motion 



fo 



"^. 



