CATALOGUE OF POLAR STARS. 



* >c 5 



Epoch. 



1888 



1880 



1890 



1801 



1802 



1803 



1804 



1805 



180G 



1807 



1808 



1809 



a 



k. m % s. 



7 44 35.11932067 



7 45 44.40000186 



7 46 53.35795385 



7 48 1.99234750 



7 49 10.30243731 



7 50 18.28756082 



7 51 25.94713901 



t 



52 33.28067620 



7 53 40.28776005 



7 54 46.06806156 



7 55 53.32133507 



7 56 59.34741826 



+ 69.60249801 



+ 69.28068119 



+ 68.95795199 



+ 68.63439375 



+ 68.31008081 



+ 07.98512351 



+ 67.65957819 



+ 67.33353719 



+ 67.00708385 



h 06.08030151 



+ 66.35327351 



+ 66.02608319 



\ 



0.321816*2 



0.32272020 



0.32355824 



0.32430304 



0.32496630 



0.32554532 



0.32004100 



0.32645334 



0.32678234 



0.32702800 



0.32710032 



0.32726930 



0.00099572 



0.00001238 



0.00082904 



0.00074570 



0.0000(5230 



0.000570d2 



0.00040508 



0.00041234 



0.0003291 >o 



0.00024566 



0.0001C232 



0.00007808 



\ 



+ 0.0000*331 



+ 0.00008334 



+ 0.00008331 



+ 0.o(K.08334 



+ 0.00008334 



+ O.OH00 134 



+ 0.0O008334 



+ 0.00008334 



+ 0.0000 1 



+ 0.001 ii 18334 



+ 0.00008334 



It will be seen that the result for 1S99 agrees with that already found 



the 



fourth decimal place. 



Reduction of a and 8 from any Time t to any Time t' by Means of the Precession for th 



Mean Interval. 



has given the following expressions (Mem. Roy. Astron. Soc, XIX. pp 



Main 



127, 128, 1851), which he has derived from the method printed out by O. Stm 

 his "Bestimmung der Constante der Precession" (Mem. de l'Acad. Imp. d 

 Petersburg!!, 6th Series, III. p. 49, 1841). 



St 



Let 



Pi> 1 



p 3 , p i7 p 6 , represent the values of the precessions for the times 



2 



3 



4L 5t, and let P„, P,, and P K i 



3? 



4? 



P 



P l 



for the menu 



intervals. 



Then 



we have 



for the total effect of the precession at the end of any g 



time 



