The most reliable data concerning sun-spots begins with 

 Schwabe's observations aboul 1825 or 1826, and extends down 

 to the present time. The older data generally embodied in 

 tables were collected by Wolf, aboul 1850, long subsequent 

 to the events. According to Prof. Young, Wolf rummaged in 

 attics and unearthed scraps of astronomical records, taken 

 mainly with no idea of periodicity, and with these he pieced 

 out, as besl he could, the earlier pari of the table from 1610 

 to 1826. 



In the following table we have taken Schwabe's data of 

 sun-spot maxima from 1 s.'IT down, supplementing his table 

 with authenticated Inter records, in order to institute a com- 

 parison between these dates and the dates of Jupiter's major 

 equinoxes : 



Major Equinoxes Sun-Spo1 



of Jupiter. Maxima. Difference. 



1836.16 1837.2 +1.04 



1848.02 1848.1 -4- .08 



1859.88 1860.1 -f .22 



1871.74 1870.6 —1.14 



1883.60 1883.9 -f .30 



1895.46 1894 —1.46 



1907.32 1906-7 (?) 



In the above table when the sun-spot maximum is subse- 

 quenl to the equinox the difference is indicated with a pins 

 sign; when the maximum preceds the equinox, the difference 

 is marked with a minus sign. The greatesl variations are 

 -(-1.04 and — 1.46 years, and the average of all is only .TOG — 

 say an average difference of only eight and one-half months. 

 This covers a period, in the definite comparison, of fifty-seven 

 years, Encludmg the 1906 or 1907 date, which, when results 

 are calculated, will probably show a close approximation, the 

 entire period covered is seventy years. This seems long 

 enough to constitute ;i very fair investigation. No other com- 

 parison of an astronomical event with sun-spot maxima lias 

 shown such a close coincidence. 



The equinoxes of -Jupiter being nearly midway between 

 the perihelion and aphelion points, it follows that the solstitial 

 points must nearly coincide with the perihelion and aphelion 

 points in his orbit. According to Prof. Tice, the solstices of 



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