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ASTRONOMICAL PAPERS. 87 



the latitude of the obfervatory was fixed, and fo 

 would its longitude have been fixed by the ab(3ve work 

 alfo, if we had known cither the longitude of the middle 

 point, or of the ftone on Fen wick's Ifle. But this not 

 appearing from any part of the w^ork of Meffrs, Mafon 

 and Dixon, left among their public papers in this province, 

 the American Philofophical Society ordered us in the 5th 

 Month, (May,) 1770, to take the courfes and diflanccs 

 from New-Caftle Court-Iioufe, to the obfervatory in the 

 Statc-Houfe fquare, by which means the middle point 



5 



and confequently our obfervatory at Ix^ves might be con 

 neded with the Philadelphia and Norriton obrcrvatorics, 

 and fo the longitude of the two latter being known, the 

 longitude of the former would be known alfo. Our v/ork 

 is as follows. 



Courses. 

 Begun at the cen- 

 ter of Ncwcaftle 

 Coint-Houfe. 



N. 39 

 N. 32. 



N. 4^- 



N. 6. 



N. I. 



N. 19. 



N. 16. 



N. I a. 



N. 7- 



N. 4»- 



N. 19- 

 Nonh . 



N. a. 

 N. 7- 

 N. 35. 

 N. 59- 

 N. 41. 

 N. 51- 



N. 49- 



00 K 



50 E. 



50 W. 



O E. 



30 E. 



30 E. 



o B. 

 o E. 

 o W. 



o W. 

 o E. 

 o E. 



55 f 



50 E. 



30 E. 

 o E. 



3,5'^ 



40 



50 

 80 



3% 

 66 



19a 



50,%Z 

 89 

 i8t 



944 

 87 



48 



N. 



N. 



N. 

 N. 

 N. 

 N. 

 N. 

 N. 

 N. 

 N. 

 N. 

 N. 

 N. 

 N, 

 N. 

 N. 

 N. 

 N. 

 N. 

 N. 

 N. 

 N. 

 N. 



Cl)lU'iC9. 



43. 30 E. 

 15 E. 



30 E, 

 %o E. 



E, 

 o E. 



o E. 



o E. 



45 ^• 

 o E. 



o E. 



o E. 



^ o E. 



15 E. 



30 E, 



30 W. 



30 E, 

 o E. 



25 E. 

 o E. 



X5 K. 



rt^ 



45. 



60. 

 78. 



6z, 

 69. 



71. 



4 



S 

 C7. 



A9- 

 74. 

 64, 



S9' 



73. 



56. 



6r. 



Pcrehca, 

 168 



2.3 » 



188 

 135 



IIZ 



140 

 76 



14S 



i 



Co 



N. 3?. 



N. 

 N. 



N. 



47. 

 II, 



N. 55. 

 S. 73. 





N. 



N. 



s. 



N. 



83. 



70. 



73' 

 50. 

 88. 



71. 



87. 



7?. 



South. 



■urib«, 



o E, 

 o E, 



40 E, 



E, 



40 E» 



ao E. 



40 E. 

 30 E. 



30 E, 



o E. 

 40 E. 



i'^9 



43'*^ 



406 



66 



4* 



37 

 x6% 



790 



100 



189 

 X04 



To the cciucr of the obfer" 



VM017 In the Suif-XIoufc 



tdrtjih. 



w 



N. B. The variation ofthe needle by \vhicb thefc coufft's were talu u wftg 3 



a'j allowed for in reducing the work 



ThiiH by the above work we get-- , , , . , ^ 

 Kcw-Caillccourt-houfc wefi: orPliiladclj'lua oblCTVutory 

 Middle point of Peuinfulu weft of Ncw-CalUc court houfe 



Their fum gives the middle point wcfi of Thilarfelphia obfervatory 

 But (p. 86.) the middle point is wcil of the Lewes obfervatory 



inur cUfTerencc gives the Lcwcs obfervntory cad of the Pbibulelphia obfervatory 

 This diiferenec gf fixty-two pcrchcsdocs not give tj^nite u fccond of tiuic diifcrciic 



. i5'V7ea,whu:h 



Perches, 

 70ihS 



9^n*7 



-,0/, 



9'^'>.:i 



n 



62.6 



c of longitude. 



And 



