288 CATALOGUE OF POLAE STAKS. 



We now have : 



h. m. s. 



''o A A A e •" 



77 ^» ^' ^» " Tt 



, a t II II 



1875 729 5.6310 +73.5143 +88 59 37 .09 -7.001 



-1.2248 -0.392 



1879 7 33 57.2480 +72.2895 -0.0275 +88 59 6.50 -7.993 +0.010 



-1.2523 +0.0052 -0.382 



1883 7 38 43.9101 +71.0372 -0.0223 +88 58 33.76 -8.375 +0.011 



-1.2746 +0.0048 -0.371 



1887 7 43 25.5157 +69.7626 -0.0175 +88 57 59.52 -8.746 +0.010 



-1.2921 +0.0046 -0.3G1 



1891 7 48 1.9877 +68.4705 -0.0129 +88 57 23.81 -9.107 +0.010 



-1.3050 -0.351 



1895 7 52 33.2626 +67.1655 +88 56 46.68 -9.458 



Assuming +0'.0044 for the third difference of -^ opposite 1893, and +0".010 



7 A 



for the second difference of — , we have : 



dt ' 



o .|i Ai Aj A, S -^ A, A, 



h. m. s. s. ° ' " " 



1891 7 48 1.9877 +68.4705 -0.0129 +88 57 23.81 - 9.107 +0.010 



- 1.3050 +0.0044 - 0.351 



1895 7 52 33.2626 +67.1655 -0.0085 +88 56 46.68 - 9.458 +0.011 



-1.3135 +0.0042 -0..340 



1899 7 56 59 3003 +65.8520 -0.0043 +88 56 8.17 - 9.798 +0.010 



-1.3178 +0.0040 -0.330 



1903 8 1 20.0768 +64.5342 -0.0003 +88 55 28.32 -10.128 +0.010 



-1.3181 -0.320 



1907 8 5 35.7067 +63.2101 +88 54 47.17 -10.448 



After proceeding thus far, it will be advisable to recompute the values of 



— and — , and the resulting values of a and S. Then, with the more accurate 

 dt dt' ° 



series of differences, the computation for several intervals in advance can be safely- 

 made. It will be found that the values of S and -- require no change. For 



a and — we find : 

 dt 



