Astronomical and Nautical Collections. 



131 



tion of Bradley, which had induced him to employ a correction 

 somewhat more considerable than the mean of the results from 

 Mr. Groombridge's observations. 



EMPIRICAL TABLE OF REFRACTION. 



ii. Errors of the Lunar Tables for 1819 and 1820. Com-puted 

 from the Observations made at Greenwich. 



(See Collections III. ii.) 



7.6 



.5.7 



4.3 



Greatest Error of 



three consecutive 



observation^ in 



Longilndc. 



16.6 

 11.0 

 11.1 



K 



