ASTRONOMICAL OBSERVATIONS. 35 



DifF of Iciijitude br tile correfponJ-l . ,„ ,,, ^ ,- i r. t- 



ing obkr\ ii'inns ot Augult 3a. j • 



Do. by Do. of Auguft loth 20 7 45 Do. Do. 



Do. by Do. of Augiirt 19th 18 37 45 Do. 4ih Satellite. 



Do. by Do. of Anguft 29tli 20 i 40 Enierfion 2d Satellite. 



Do. by Di'. of September 15th 20 58 10 Do. 3d Satellite. 



Longitude by the 2d 3d and 4lh Sa-7 -— — -— - ,-■ t •• j 

 .^'r,„ ,11 T 1 }■ 20 2 25 = Mean Longitude, 



teilites colb ctively. J -' o 



Do. by the ift Satellite 19 59 50 



2c I 7v Mean. 



Hence the diflance between the obfervatories exceeded 5 de- 

 grees of longitude, (being the extent of Pennfylvania weft from 

 a point on the Delaware,) by 1" y"'.$. 



After the determination, we completed the fouthern boun- 

 dary of Pennfylvania ; it being likewife the north boundary of 

 Maryland, and a part of Virginia, and which had been carried 

 on fome years before by Meflrs. Mafon, and Dixon, the dif- 

 tance of 242 miles.* 



On the 9th day of June 1785, the following obfervations 

 were made at the weft end of the above line to trace a meridian 

 north, for the weftern boundary of Pennfylvania, and the eaftern 

 boundary of a part of Virginia. 



DifF. in time between the paiTage o^ a Libia, and /ST ,, , ,, 



Urls Min. ovei our line. ^ c 12 40 .5 



Right Afcenficnof /3 Urfse Min. 7' 12° 54' 6" 

 Do. a Libias. - 7 9 46 o 



DiiF. - -38 6intime=ro 12 29 .2 



Error of the line in time - - o o 11 .a 



By the above error of 11 ".3 in time, it appears that our 

 line was inclined to the weft k,-]" in fpacc, which was correfted 

 on a bafe of 300 perches. 



June 29th about 17 miles north from our firft ftation, we 

 correfted our line by the following obfervations. 



Diff. in time between the paifage of a Libra:, and /2 Urfx 7 ,, , ,, 



Minoris over our line. j ' 



Right Afcenfion of /S Unx Min. 7' 12° 53' 50" 

 Do. cf a Libra:. 7 9 46 1 1 



Diff. - - 037 39=intimetoo 12 30 



Error of the line in time. - - - o o 13 diff. 



The 



* This line is in the parallel of 39" 43' 18" north latitude. My affociates in this part 

 of the buCncls were, Dr. Rittenhoufe, Dr. Ewing, Mr. Andrews, and Mr. Hutchins. 



