ASTRONOMICAL PAPERS. 



JI3 



4C 



on the day of the tranfit; whence the Sun's mean horizon- 

 tal parallax Ihould be 8'^84. But whatit will be as refult- 

 ing from the obfervations of the late tranfit, cannot be 

 known without a number of laborious calculations, which 



1 have undertaken. 



The Swedes and Ruffians were very unfuccefsfuL No 

 complete and thorough good obfervation of the total dura- 

 tion is come to hand from the north. Our obfervers at 

 the North Cape faw the ingrefs only, and that in a very 



bad flate of air. 

 " The iy//^«V/i^^y obfervers, Meilrs.Dymond and Wales, 



had better luck, and obferved all the contads, and ncarcPc 

 approach of the centers, as follows. 



I ft External contact 



n 



I ft Internal contaft 



o\ 51': 



4 '5 



I. IC. 2^ 



1 



I 



2d Internal contaft 7. o, 47,5 

 2d External contad 7. 19-21 



J 



". All appar.time. 



■The hH very hazy. 



" At 4\ 5'. 30% apparent time, was the ncareft ap« 

 roach of Venus to the Sun's center; when the diftancc^of 

 her interior limb from the Sun's limb was 6'. 22^' 



The 



diameter of Venus was 59^,5 and the Sun,s horizontal dia- 

 meter 31'. 32^,4. Hence the neareft approach of Venus 

 to the Sun's center was about 9'. 54^', or 7" lefs than by 

 your obfervations; undoubtedly owing to a greater parallax. 

 Tbeir latitude is 58^47' 30'' north. They could only ob- 

 ferve five occultations of ftars by the moon to deterniine 

 their longitude, and 1 have not yet found any obfervations 

 made in Europe, or elfewhcre, corrciponding to them.^ 



t'lcouldwifluhat the diflcrence of meridians of Norriton 

 and Philadelphia, could be determined by fomc raeafui'es 

 and bearings, within one*fiftieth or one-hundredth part of 

 the w4u)le; in order to conned your obfervations withthofe 

 made at Philadelphia a,nd the Gapes of Delaware, as alfo 



Nor 



w 



T 



ith 



M 



cpurfe of meafuring the degree of latitude. I hope to be 



favoured 



