Smithsonian Report. 1947. — Nicholson 



Plate 1 



i 

 i 



# •' J 



/■J 



APR. 13 iMKm 



The Largest Group of Sunspots Ever Photographed 



Daily photosi'tililis siiowing the great sunspot group of Klarch and April 1947, being carried across the solar 



disk by the sun's rotation. 



