LONGITUDE. 



153 



From the "Greenwich Observations" for 1S}() we obtain tlie followins: observed eorreetions of the .\R. of Ibe moon's 



bright limb : 



July 27. IstL 



28 



Aug, 



29 



31 



1 



3 



3 



4 



6 



8 

 11 



29 

 31 



9 



2d L 



0.51 

 .55 



.48 

 .48 

 .2G 

 .44 



.18 

 .73 



.38 

 .38 

 .54 



.62 



Aug. 23 IstL 



24 



Sept. 5 2d L 



8 



1.22 



.68 



r 



.4G 

 .47 

 .22 

 .41 

 .51 



Sept. 22 IstL 



25 



26 

 30 



Oct. 2 2d L 



4 



5 

 8 

 9 



Oct. 28 Istl 



29 



31 



Nov. 1 2d L 



4 



5 



Longiiude of Camp Riley by corresponding observations 



h. m. s. 



July 27 7 48 37.98 



28 23.51 



7.45 



+ 



37.60 

 31 39,29 



29 



30 



Aug. 3 7 48 51.51 



29 



Sept. 5 

 30 



39,97 



6.99 



18,27 



20 



Nov. 1 



5 



Mean 



Probable eiTor of result 



Probable error of sin;xle observation 



7 48 24. 70 



2.32 



8.05 



5. 

 0. C8 

 .15 

 .22 



. 67 



.65 



.47 



.67 



.60 



.6 



i 



.73 



.50 



.60 

 .74 



A. m. f. 

 Oct. 28 7 48 24.48 



15.13 

 13.41 

 25.37 



Tlie following have been adopted as corrections for the respective lunations : 



s. 



July 27 to August 



August 23 to September 



0.47 

 0.54 



September 22 to October 

 October 28 to November 



0.48 

 0.63 



Applying these corrections to the computed AR. of the moon's hmb for each date of observation, and comparing ^-ith 



the observed AR., we obtain : 



A. m. s. 

 July 27. _ 7 48 36.81 



28 



29 

 30 

 31 



Aug. 2 



3 



26 

 27 



20.90 



6.88 



37. 32 



45.08 



29.28 



39.60 

 23,07 



36.91 



A. 7W. *• 



Aug. 28 7 4S 



29 



Sept. 3 -- 



4 



5 



24 



27 



28 



29-- 



21.77 

 41.89 

 9.77 

 1?:.54 

 15.12 



4L90 

 34.61 

 22.98 

 21.85 



h, M. I. 



.Sept. 30 7 48 17.78 



Oct. 23 

 25 

 28 



29 



Nov. 1 



2 

 5 



34.80 



22.50 

 25,02 



14.09 

 16. IT 

 18.00 



Mean 



Longitude of Camp Riley, computed in the field from the predicted place of the moon in the 



Greenwich ephcmeris for 1849 







22 



.75 



A. 



m. 



8, 





7 



48 



25. 



98 



7 48 



13. 



1 



Difference 



12.88 



Probable error of a single observation.. 

 Probable error of r e.sult 



s. 



7.21 



1.44 



Vol. I 



20 



