DETERMINATION" OF THE ELEMENTS OF THE SUN'S SPIN. 



'i ( . ; 



T shall not reproduce all the numerical values obtained in this way 

 for the whole interval of nearly 24 years. As an example, I shall 

 give the complete method <>f reduction for the year 1884. In discuss- 

 ing in this way Spörer's observations, I shall ofeour.se adhere to the 

 numbering of the different groups he has «riven. Table I. contains 

 the number of each Potsdam group and the variation of latitudes per 

 10° of longitude, the same result being represented in a somewhal 

 altered form in fable II. on separate sheet. 



Table I. 

 L884. 



