ASTRON OMICAL OBSERVATIONS. 



Emerjions ohftwed (it WUm'iiglon. 



Emerfons olfirved at th: ivejlern Ob 

 firvatory. 



Obfervers. " o« 



Ewins;, A 



Madiibn, B 



Hu'chins, kC 



Eilicott. \D 



E\vini>-, A 



-Madifon, P. 



Hiitcliiiis, C 



E'.licotc. D 



Day of the 

 Month. 



ept. 15, 



Sept. 19 



MeanTime.|Obfervers. -3 g- 



i2"44'i5" 

 12 44 8 

 12 -13 45 



7 59 12 

 7 58 54 

 7 59 6 



Andrews, H 

 Lukens, F 

 Rittenhoufe. G 



Andrews, H 

 Lukens, F 



Rittenhoufe. G 



Although the correfponding obfervations only, were admitted 

 in the decifion, the non-correfponding ones may neverthelefs 

 be ufeful for fixing the geographical fitnations of other places, 

 where correfponding ones may have bsen made. 



In drawing a conclufion from the foregoing obfervations, it 

 was thought neceffary to confider what dependence ought to be 

 placed in each fatellite ; becaufe their different velocities, will 

 give different degrees of certainty. The firil fatellite is fmall, 

 but the rapidity of its motion is much more than a compenfation 

 for this deficiency : Its luftre is much fooner loft, or acquired, 

 than that of the fecond : On the fame account, the fecond is 

 better than the third, and the third than the fourth. — The flow 

 motion of the third and fourth fiitellites, will occafion great un- 

 certainty, if the atmofphere fliould be more hazy at one ob- 

 fervatory, than the other, at the time of obfervation : this is 

 manifeft from the correfponding obfervations of Auguft 19th 

 and September 15th, both of which would have been re- 

 jected, had they not countera<5ted each other. The firft fatellite, 

 being fo much iuperior, on account of certainty, to either of the 

 others, we thought proper to put as much dependence upon it, 

 as upon the others colieftively, and that the mean of thofe refults, 

 fliould be deemed the aftronomical diftance between the eaftern 

 and weftern obfervatories. 



The correfponding obfervations on the firft fatellite, are thofe 

 of Auguft 1 6th and September 19th. 



D-ff. of longitude by the corre'p^nd-'} ^ , , 

 inp; obfervations of Auguft i6th. j "^ ^ 

 Ditto by do. Sept. 15th. 19 58 



DifF. of longitude by ill Satellite. '1959 50: 



10'" Immerfion id Satellite. 

 30 Emerfion ift Satellite. 

 \hi Mean Longitude. 

 Diff. 



