400 



COMPARISON OF CATALOGUES OF STARS. 



arranged in the order of right ascension and a curve is drawn through the points thus 

 found. 



REDUCTION OF 



THE HARVARD COLLEGE OBSERVATIONS TO THE 

 SYSTEM OF AUWERS. 



It is not considered necessary to give the details of the reductions which form the 

 basis of the tables given below. After the sum of the corrections determined by the 

 method described above from groups between the limits 8 = — 10° and 8 = +80° had 

 been applied, it was found that the deviations from the normal system were as 

 follows : — 



Auwers minus Harvard College. 



Iushluul* in a. 



-30 . 

 -25 . 

 -•20 . 

 -15. 



-10 . 

 - 5. 

 + 0. 

 + 5. 



+10. 

 +15. 

 +20 . 



+•25. 



+30 . 

 +35. 

 +40. 



+45. 



+50. 

 + 55 . 

 +60, 

 +65 , 



+70 

 +75 

 +80 



-25 

 -20 

 -15 

 -10 



- 5 



,- 



+ 5 



+10 



.+15 

 . +20 

 .+25 

 .+30 



.+35 

 .+40 

 .+45 

 . +50 



. +55 

 . +60 

 . +65 

 .+70 



. +75 

 . -so 

 .+85 



An 



—.006 



-.001 



+.007 



-.009 



+ .012 

 -.002 

 -.016 

 +.001 



-.007 

 -.002 



-.002 



+.007 



+.003 

 +.003 

 +.003 

 +.005 



-.001 

 +.003 

 +.006 

 -.009 



+.005 

 -.014 

 -.003 



-31.5 . . . -27.5 



-27.5 . . . —22.5 

 -22.5 . . . -17.5 

 -17.5 . . . -12.5 



-12.5 ... - 7.5 



- 7.5 ... - 2.5 



- 2.5 ... + 2.5 

 + 2.5 ... + 7.5 



+ 7.5 . . . +12.5 

 + 12.5 . . . +17.5 

 +17.5 . . . +22.5 

 +22.5 . . . +27.5 



+27.5 . . . +32.5 

 +32.5 . . . +37.5 

 +37.5 . . . +42.5 

 +42.5 . . . +47.5 



+47.5 . . . +52.5 

 +52.5 . . . +57.5 

 +57.5 . . . 62.5 

 +62.5 . . . +67.5 



+67.5 . . . +72.5 

 +72.5 . . . +77.5 



+77.5 . . . +82.5 



Aa 



-.010 



-.mil 

 +.005 

 -.001 



+.009 

 +.003 

 -.006 

 -.011 



• .002 



-.006 

 -.001 



+.000 



+.003 



+.005 

 +.oo3 

 +.005 



+.002 



+.001 

 —.001 



—.002 



-.006 

 -.002 

 -.025 



-30. 

 -25 . 

 -15 

 - 5 



+ 5 

 + 15 



+25 

 +35 



+45 

 +55 

 +65 



+75 



-25 

 -15 

 - 5 

 + 5 



+ 15 



+25 

 +35 

 +45 



+55 

 +65 



+75 



+85 



Aa 



-.004 

 + .000 



+ .004 

 —.009 



-.003 



-.002 

 +.004 

 +.002 



+.003 



: .(Mil 



-.003 

 -.014 



10 

 12 

 14 



16 

 18 

 20 



10 



12 

 14 

 16 



18 

 20 

 22 



21 



Aa 



+.003 

 + .000 

 +.000 

 -.001 



-.005 



+.004 

 +.001 

 +.003 



-.003 



+.002 

 +.002 

 + .003 



