DETERMINATION OP THE ELEMENT? OF THE SEX'S SPIN. -' i 



These give the following results : - 



It should be noticed thai the values of the ascending node obtained 



from J)' serves to check the previous determination. The difference 



amounts to almosl forty seconds of arc which 1 do nol consider too 



much for this kind of determination. À comparison of the values 



deduced from A'. B\ and C, seems to hint at a certain increase in 



the /allies of node in time. This was assumed by Spörer, but I do 



not insist on this point firmly. [ also here notice that in his reduction 



of spot observations, Spörer has since 1880 applied a correction for 



refraction due to the sum's atmosphere; so thai the heliographic 



latitudes deduced are somewhal different. I have, however, used the 



deduced values of longitudes and latitudes without alteration. 



throughout the long series of 24 years. 



The principal conclusion to be drawn from the present calculatio - 



is thnt the values of the ascending node of the sun's equator given 



by Carrington and Spörer are distinctly smaller than the values now 



deduced. VVilsing's values, however, resembles mine pretty closely. 



Finally I venture to propose the loll »wing elements for 1861. 



/ 7°.006 ) 



1861 

 A r 76°.003 I 



In conclusion 1 desire to acknowledge my indebtedness to Prof. 



Terao, Director of the Tokyo Astronomical Observatory for his kind 



and valuable suggest i' ms. 



DO 



