JPro/. Fisher on the Orhitof the Cumit of 1819. 



311 



published iu a New Haven periodical paper, under 



the date of July 30th, and 

 Perihelion distance 



,3416 



Time of passing the perihelion, June 37tb, 8'" even, mean 



time, N. Haven, 

 Inclination of the orbit 

 Longitude of the ascending node 

 Place of the perihelion 

 Motion direct. 



^ k 



80° 53' 



75 3S 



285 30^ 



>/ 



■f 



r 



These elements were obtained by a simple graphical process, 

 which is believed to possess some advauta^^es over those usually 



described in astronomical treatises. 



The late comet appeared under circumstances peculiarly un 



fa 



of its orbit by the 



g 



methods. In addition to the short 



t 



the 



all arc of its 



horizon, the po 



of 



and 



orbit with respect to the earth was 



such, that a small error in its geocentric position would produce a 

 comparatively large one in some of the elements, Obscrvationa 

 taken soon after it appeared would have been peculiarly valuable, 

 on account of the rapid motion in latitude; but none could be 

 made in New Haven with insttruraents of sufficient accuracy to 



correcting the orbit^ till July 6th : 



and 



pproach of 



deserve any reliance in 

 these could not be employed^ on 

 the angle made by the radius vector of the comet and the visual 

 ray of the earthy to 90^ Observations made near the 13lh could 

 not be advantageously employed, on account of the near approach 

 of W\^ ^projection of this angle on the plane of the ecliptic, to 90?. 



4^ 





m. 



