CATALOGUE OF POLAR STARS. 



287 



We now compute the values of a for the years 1883 to 1899 by formula (54) 



For 1875 i>, = + 73.5143-24 



1879 \p.= +289.1.57864 



1883 joj = + 71.037178 



Sum +433.709366 



For 1879 71, = + 72.289466 



1883 4/>, = +-284.148712 



1887 i>8 = + 69.76-2627 



Sum +426.-200805 



^3= +0 7-2.2S4S94 

 8P3= +0 9 38.-2791 



«o = 



•29 5.6310 



For 1883 a - 7 38 43.9101 



P3=+0 



71.033468 

 8 P3 = + 9 28.2677 

 «!= 7 33 57.-2480 



For 1887 a = 7 43 25.5157 



For 1883 /', = + 71.037178 



1SS7 4 /)., = + -279.050508 



1891 /, = + 68.470504 



Sum +418.558190 



For 1887 i\ = + 69.76-2627 



1891 4;)j= +27.3.88-2016 



1895 ;>,= + 67.1655-22 



Sum +410.810165 



P, = + 69.759698 

 8P3= +0 9 18.0776 

 «,',= 7 38 43.9101 

 For 1891 a = 7 48 1.9877 



P, = +0 68.468361 



8^3= +0 



For 1895 « 



9 7.7469 

 7 43 25.5157 

 7 52 33.-2626 



From this point the approximate values of '^ required for the computation 

 of the next and the following dates can be found from the successive orders of 

 differences of ^ already found. Each result for a shovdd be verified by a second 

 computation before proceeding to the next in order. The values of the precessions 

 in declination vary so slowly that a second computation will not be necessary. 



