18380 



Motion of the Solar System in Space. 



393 



duce the mean of the numbers in the column " General mean P. M." 

 (-which now ^ 0024s.) to 0 : if, in addition to tins, we convert these 

 measures into space, and then multiply each by the constant 845* to 

 convert them into arc, we get as follows : 



A. R. of group. Reduced apparent annual P. M. in A. R. in arc. 



h. 



m. 





// 



h. 



m. 







0. 



30 



-f- 



0,0368 



Xll. 



30 



— 



0,0024 



I. 



30 



+ 



,0266 



XIII. 



30 





,0254 



II. 



SO 





,0000 



XIV. 



30 





,0203 



III. 



30 





,0026 



XV. 



30 





,0077 



IV. 



30 



+ 



,0101 



XVI. 



30 





,0393 



V. 



30 





,0139 



XVII. 



30 





,0140 



VI. 



30 





,0114 



XVIII. 



30 





,0076 



vn. 



30 





,0173 



XIX. 



30 



+ 



,008^ 



Vill. 



30 





,0101 



XX. 



30 





,0203 



IX. 



30 





,0190 



XXI. 



30 



4- 



,0444 



X. 



30 





,0127 



XXII. 



30 



+ 



,0304 



XI. 



30 





,0076 



XXIII. 



30 





,0368 



The above table I have entitled "Apparent P. M.," because it exhibits, 

 as apparent P. M. should do, two neutral points, and one of -f-, and 

 another of — maximum. Thus we find neutral points at bh. and IDA. ; 

 and one of + maximum at Qh. and one of —maximum, not so distinctly 

 marked, between 9A. 30m. and 16A. 30m. We will now leave the con- 

 sideration of this table for the present, and examine the results for 

 declination. 



* If ^ ' S', &c. represent the declination of the several stars in each group, then the 

 reduction into arc is effected by multiplying by ^o^ ^ _|_ cos _^ cos 8;c. 



n 



•which in this case being very nearly constant for each group, the constant, 845 may 

 safely be employed. 



