398 



ON THE MEAN PLACES OF 84 FUNDAMENTAL STARS. 

 CALCULATION OF PLACE FOR 1850 AND ANNUAL VARIATIONS &c. 



FOB SAME TIME. 



[48 





- 0-00034 



0-1684 



[Here follows Table of Elements for calculating the Mean Places of 

 the Standard Stars, extracted from Mr Farley's Calculations of Fundamental 

 Stars for 1850.] 



The Right Ascension for the time 1850 + t is 



and the Declination for the time 1850 + is 



where A 2 c and AV are the 2nd differences of the respective precessions given 

 in the Table. 



By these formulae the places were calculated for every 5th year from 

 1830 to 1870, the results differenced, and then interpolated for every year. 



