The amounts of radiations received from the sun at 42° N. latitude at various hours of the day throughout the year, both in the visible spectrum and in the ultra violet, were determined experimentally. Curves are plotted and tables are given to show what percent of the total comes from the sky alone in each of these regions of the spectrum. From these data, one may determine the relative amounts of ultra violet or visible radiations received at any two periods of the day or year either from sun and sky combined or from one of these alone.
Proceedings of the Iowa Academy of Science
©1932 Iowa Academy of Science, Inc.
Kunerth, William and Miller, Russel D.
"Variation of Intensities of the Visible and of the Ultra Violet in Sunlight and in Skylight,"
Proceedings of the Iowa Academy of Science, 39(1), 219-219.
Available at: https://scholarworks.uni.edu/pias/vol39/iss1/60