NO. 4 SUN S VARIATION AND TEMPERATURES — ABBOT I'J 



figure 8, is drawn. As just stated, the reader will have noted from 

 Annals, volume 6, that the figures 1.9 are to be understood as pre- 

 fixed to all values of the solar constant printed. Hence, the amplitude 

 of variation shown for September results, in figures 7 and 8, is from 

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Fig. 7. — Photographic reproduction of original computation of the average 

 variation of the solar constant of radiation in all months of September from 

 the year 1923 to 1944, as influenced by the period of 6.6456 days. No shifting 

 of phase admitted. 



weighted mean of such tabulations as the September tabulation of the 

 solar-constant values. for the 9 months March to November, 1924 to 

 1944. The actual sums and mean values are given in table 5, together 

 with the general mean multiplied by 10/7 as suggested above. These 

 last values determine the upper curve in figure 9. Its amplitude of 

 variation is but 0.13 percent. 



11. AMPLITUDE AND NATURE OF THE SOLAR VARIATION OF 

 THE 6.6456-DAY PERIOD 



It will be noted that the final mean amplitude of solar variation in 

 the 6.6456-day period, 0.13 percent, is even less than the probable 

 error of a single day of observation of the solar constant at one station, 



