410 CHARTS, GRAPHS, TABLES, AND COMPUTATIONS 



JAN KAR MAT JULY SEPT 



Month of the Yeor 



JM NAD HAY 



JULY SEPT 



Month of the Yeor 



Ns 



oaoo 1200 



Hour of the Doy 



OeOO 1200 I6< 



Hour of the Doy 



Figure 9.10. Annual and diurnal cycles of Ns /or San Antonio, Tex. 



