\ 



ASTRONOMICAL PAPERS. 



I IX 



All 



May 



RcvcL 



from the Kevd. Nevil Mafkelync, B. L 



''onmner RoyaU to the RevcL William Smitl 

 wji of the College of Philadelphia; acknoii 

 receipt of the N o r r i t o n Obfewations of the 

 h:NUS, and giving fome account of the Hud- 

 id other Northern Obfer^ationsofthefame. 

 'feting of the American Philofophical Society y 



770- 



Greenwich, Dec. 26, 1769. 

 IR. 



RETURN you many thanks for the account of the t^^- 

 ///^i^/^obfervations of the late tranfit of Venus ^ made at 

 NoiTiton by yourfclf and two other gentlemen which I have 

 communicated to the royal fociety^ It is ordered to be 

 printed in the volume of their tranfa£tions for this year,, 

 and 1 will take care to fee that it is printed corre£lly. 



" I fent to the Honourable Mr. Penn, a good while 

 ago, my obfervations of the ecHpfes of Jupiter's firft fatel^ 

 lite made this year, defiring that he would communicate 



them to you, and I hope you ^ have received them. 



" By a mean of your five firft ////?;;^r/9c?/zj (rejecting that 

 of May 5th as too near the oppofitionto the Sun) compared: 

 with the nautical almanac^ the difference of our meridians 



is 5''. I . 32". But by a meanof my two firft immerfions,. 

 the corredion of the nautical almanac for a 2 feet refledor 



of Short's is + 20'', 5 which applied to j 



-h 



I 



5 



• 32 gives 

 i'- 52", 5 for the difference of the meridians of Green- 



wich and Norriton by the immerfions. 



By a mean of your e^nerfions^ June 6th and 13th, 

 compared with the nautical almanac-^ the diff. of our me- 



ridians is 5\ i' 28'\5; and by a mean my of two emer 

 fions June 8th and July ift the corrcdion of the nautical 

 almanac is — I \\$^ which applied to 5\ i' , 28'',5 gives 

 5\ i^ 17" for the difference of our meridians by the ^;//i^r- 

 Jions\ but, by the immerftons it was found above, 5\ i'. 



for 



s^^s 



The mean of thefe two refults is 5\ i 



34 »7 



the 



• They arc infcrtcd above p. 19. 



