The, Motion and Distribution of the Sun-spots 



87 



XXXVIII. In the last two columns of this table, I have given the difference between the 

 number of the first and last observations at different distances from the central meri- 

 dian. This difference is almost thouroughly i)Ositive on the eastern and negative on the 

 western half of the sun. In reality, the same number of spots undoubtedly arises 

 and disappears witiiin eacli of these zones. This also proves to be approximately 

 the case with recurrent spots between about — 60° and + 60°. These spots are, 

 upon an average, certainly larger than spots observed only in one rotation. From 

 the table we see that the number of arising and disappearing spots of the latter 

 kind is tlie same only in the zone between — 10° and -(- 10". During tlie first 



Fig. 8. The Difference between the Number of first and last Observations of Sun-spots 

 at different Distances from tlie Central Meridian. 



period (1886 — 1897), 310 such spots arose within this zone and 318 disappeared. 

 During the second the corresponding numbers were 222 and 224. 



Is the opinion of Stephani confirmed by this table? Without entering into any 

 furtlier discussion of the table in question, I will merely call atttention to the fact 

 that the number of first observations of recurrerit spots between — 60° and -{-■ 60° 

 during the first period amounts to 0.51 and during the second to 0.60 of all 

 récurrents spots that have been observed. The corresponding numbers for non-recurrent 

 spots are 0.68 and 0.70. That these numbers are greater than ^ may be due to 

 the non-observance of a great number of the spots arising on the other side 

 of the sun. That these ratios are greater for non-recurrent than for recurrent 



