ASTRONOMICAL PAPERS. 



57 



tient to know the refult of what was done in this place, I 

 have endeavoured to deduce it from our obfervations alone ; 

 and flatter myfelf, that in the conclufion it will be found 

 pretty accurate; as it is nearly the fame with what I had 

 before found it to be, by an hundred and forty determina- 

 tions of it, from the obfervations of aftronomers on the 

 tranfit of 1761; and alfo from another method, the in- 

 vention of the celebrated Mr. Stuart, of Edinburgh; both 

 which I have now annexed to the follovving calculations. 



Having thus collected together all the elements necclHuy 

 for the enfuing calculation, before I proceed to it, I mull 

 in juftice to Dn Williamfon and Mr. Prior, obferve, that 

 of the micrometer meafures, the 2d, 3d, 19th, 20th, 21ft- 

 2 2d, 23d, 24th, and 25th were made by Mr. Prior, and 

 the 35th, 43d, 44th, and 54th by Dr. "Williamfon, with the 

 fame adjuftme^t of the focus, that I ufed in the others. 



I have takeiithe trouble of making above fifty determi- 

 nations of the middle of the tranfit, and find from a mean 



r 



of them, that the neareft approach of their centers was at 



T 



5\2I' 



27" mean time, or c^' 



23 



^ . 41 57 apparent time, 

 which was haftened by parallax 4'. 48'' at Philadelphia; 

 and therefore, that the central apparent time of the middle 

 of the tranfit was ^^. 28'. 29'',7, according to our meridian. 

 By comparing together eighteen determinations of the 

 neareft diftance of the center of the Sun and Venus, I find 

 the mean of them to be \o\ z\s^^ ^^ ^^^^^ ^^^ Philadelphia. 

 But ihe was then deprcded 6'',9i by parallax; and there- 

 fore, the geocent. neareft diftance of the centers was lo^ 



IO% 



49 - 6 10'^ ,49. Tlicrefore fay. 



As 72626,4.5 the difb-iuce of ^ from tljc : 28879,55 her diflacce from @ : : 610^40 ; 

 lipliuccniric diilaiuc of their ccuUu's. 



4. 86i,oy49 

 4. 460,5904 

 2. 785>67a5 ^ 



I ; 



7_^ 246,26H9 



a."38<,I74o=-^242^758.^==4^ 2^7583 the hcnoccBt.rk dillancc of their ccut-rs* 

 As b, 3 . 23/ iQil the inch of $ orhit to the ecHp. : R : : S, 4'. 2^^,758 : Sine of fT)'s d=il 

 from the node of 9 . '^ - 



8. 771,6803 

 10. - - - 



7' 07o,25o6_ 



Vol, L H Now 



