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ASTRONOMICAL PAPERS. 



S3 



V 



But as there are but two or three of them correfpoadeat 

 with ours, we aiufthaverecourfe to another method; which 

 is fufl to compare them with the calculations in the nau- 

 tical almanac, which were made forthemeridian of Green- 

 wichj that the error of the tables may be difcovcred by 

 the mean of them; and then to compare ours with the 

 fame calculationsj applying the errors of the tables to the 

 longitude deduced from this comparifon. We may depend 

 upon the refult of this method with much more confidence, 



than upon any fingle obfervation. 



Here follow the Apparent Times of the Greenwich Obfervations compared with the calcuh* 



tions of the Nautical Almanac. 



1769. 



Mar. 



, 29, 



ay, 



h. 



\%. 

 12. 



m. 



:v4. 



fee. 



7 Ira. 1/7 obf. at Green. 

 a6 Do. p. calc. of N. Ah 



1769. 

 April 



D. 



28, 



a8, 



6, 

 6, 



h. 



14 

 14. 



II. 

 II. 



m, 



■ Z5- 

 36. 



51- 



51- 



. fee. ^ 

 , 17 Im. I/? obf at Green. 

 14 Do. p. calc, of N, Ah 



Apr. 



II, 



14. 

 14. 



50. 

 50. 



1 



41 IZrror Weft. 



1% Im. %d obf. at Grcciiw. 

 4 Do. p. calc. of N. Ah 



May 

 May 



57 Error Eaft. 



3 Im. %J obf, at Greenw. 

 45 Do. p. cale. of N. Ah 





la, 

 la, 



16. 

 16, 



16. 

 16, 



41. 

 41. 



34. 



19 Error Weft, 



13 Im. T/? obf. at Grcciiw. 

 13 ViK:). p. caic. of N. Ah 



00 



16 Em. I/? obf. at Green. 

 s6 Do. p. calc. of N. Ah 



Jo Ertor Eaft. 



33 Em. xfi obf. at Green, 

 ^$ Bo. p. calc. of N. Ah 



16, 



16, 



9- 

 9- 



3 a. 

 I 



50- 



SO. 



43 Error Eaft. 



IS Em. i/?obf.atGrecnw. 

 7 Do. p. calc. of N. Ah 



'June 



8, 



9- 



9- 



11. 



II, 



J^'h 



I, 



9- 

 9- 



. 8 Error Weft, 



^4 Em. ij o\^. at Greenw., 

 37 Do. p. calc. of N. Ah 













13 Error Eaft. 







38 Error Weft. 



- 



Now althou^^h the errors of the firft fatcllite appear confi- 

 derable, yet if we reje£t the obfervation of the i6th of May 

 as being too near to the time of Jupiter's oppofition with 

 the Sun; the mean of thofcj which give an caftern meri- 

 dian correfponding with the calculations of the nautical 

 almanac, exactly counterbalances the meanof thoi'e which 

 give a wcftern meridian correfponding with them. There- 

 fore we luive ncahing to do but to reduce all our obferva- 

 tions at Norriton and Philadelphia to the meridian of Phila- 

 delphia, and then compare them with the calculations In 

 tlie nautical almanac. 



The 



