195 



Application to the Comet of July 1819. 



The observations made on the north meridian, at the Observatory 

 of Trinity College, Dublin, gave 



The latitudes and longitudes are corrected* for aberration and 

 parallax, and the longitudes are reckoned from the mean equinox. 



The metliod of Laplace-f- is very convenient for the first approxi- 

 mation, when the observations are near together, and made with 

 such exact meridian instruments as we possess at our Observatory. 



That method gave me, from the above longitudes and latitudes, J 

 perihelion dist. = ,3397, and time of perihelion June 27". 15". 5'. 28". 



• A first approximation, which I computed merely to obtain the outlines of the orbit, enabled 

 me to obtain the corrections for aberration and parallax. 



+ Mec. Cel.toin. l.p.221, &c, 



J The sun's places were computed from the Nautical Almanac, but the log. of the sun'g 

 distance was taken from the Conn, des Temps, the log. of the distances in the Nautical Al- 

 manac not being sufficiently exact to be used in the correction of the approximate elements. 



