264 OBSERVATIONS OF THE ECLIPSE 



On the evening of the same day *? the astronomical 5th, 

 with the reflecting telescope, power 100, observed an emersion 

 of Jupiter's 'id satellite at !> 44' 42" per clock; the above 

 correction being applied, we shall have for the moment of the 

 visible emersion, 9 U 44' 22" 35, mean time. Clouds were 

 passing and a vapour obscured, in some degree, the disk of the 

 planet, similar to that of the 1 1th of June, though rather more 

 dense, and it is thought probable, that the emersion was seen 

 too late by 20 or 30 seconds: the longitude deduced without 

 correction would be 6 h 5' 0" west of Greenwich. 



O July 6th, astronomical time, observed with the reflector, 

 power 100, an emersion of Jupiter's first satellite, at S' 1 12' 24" 

 per clock, and the correction for the rate of the clock being 

 applied, the visible emersion took place at S h 12' 4" 81, mean 

 time, the longitude deduced would be 6 1 ' 5' 12" 19. — Now 

 as the density of the vapour of this evening and that of the 

 ] 1th of June are supposed to be equal, and that the one ob- 

 servation was an immersion and the other an emersion of the 

 same satellite, the imperfection of vision caused by the vapour 

 or by the great and strong light of the planet, so near to the 

 points of observation, would produce errors in contrary direc- 

 tions, the one advancing, the other retarding the moment of 

 visible contact, a mean of the two results will therefore proba- 

 bly be near the truth. 



Result of the immersion of the 11th of June 6 11 5' 41" 4 



Result of the emersion of the 6th of July 6 5 12 19 



Mean longitude. . . • . • ■ • • 6 5 26 



No. XLIII. 



Observations of the eclipse of the sun, June 1 6th, 1 806, made at 

 Kinderhook, in the State of New-York, by Jose Joaquin de Ferrer. 



Read August 15th, 1806. 



ACCORDING to the latitudes and longitudes of the moon 

 inserted in the French connoissance de temps, the conjunction 



