The solar radiation as filtered through the Earth's atmosphere. The latter varies at different places and at different times due to climatic or other conditions. If not much is blocked it is called sunshine.
... choreographer (+ 1983)
January 26 - Ancel Keys, scientist
February 1 - S. J. Perelman[?], humorist, author
February 4 - MacKinlay Kantor[?], historian (+ 1977)
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