Bemporad's formula

From Glossary of Meteorology



Bemporad's formula

A formula for the optical mass m in terms of the zenith distance z of the sun or other celestial body;
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For values of z less than about 70°, Bemporad's formula can be replaced by the simpler approximate formula,
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List, R. J., ed. 1951. Smithsonian Meteorological Tables. 6th rev. ed., . p. 422.