318 Bowdikh on the Elements of the Comet of 1819. 



Afterwards I received the observations of Professor Farrar at 

 Cambridge, and those of the Hon. Walter Folger at Nantucket 

 and Falmouth, which were made under the same unfavourable 

 circumstances with respect to the weather, and liable to the same 

 uncertainty from the irregularity of the refraction in a body ob- 



very 



Combining these observa 



tions with my own L obtained the following elements, published 

 in the Salem Gazette of September 28 ; which give in general 

 the lonsritudes and latitudes within one or two minutes. 



Elements of the Orbit. 



Perihelion distance 0.3363866 (the sun's distance from the 

 earth being 1.) 



Time of passing the perihelion, June 27'' 13^ 30' 20". Mean 



time Greenwich. 

 Inclination of the orbit to the ecliptic - 80^ 56' 7'' 



Longitude of the ascending node - - S73 5^ gg 

 Place of the perihelion on the orbit - 286 27 11 



Motion direct. 



By these elements it appears that the comet passed nearly over 

 the centre of the sun's disc (which is a very unusual occurrence} at 

 about 7 o'clock in the morning of June 26th at Greenwich. 



After these calculations had been made I received t\m obsprva- 



\ 



tions of Professor Fisher at New Hav^n, which I found in general 

 to agree very well with mine. He was so fortunate as to observe 

 the comet as late as the 30th of July, and I bad once intended to 

 revise the elements by means of all the observations, but upon 

 reflection concluded not to do it, supposing the above elements to 

 be as accurate as could be obtained with observations, made in 

 this manner under such unfavourable circumstances. 



