# Bemporad's formula

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## Bemporad's formula

A formula for the optical mass

*m*in terms of the zenith distance*z*of the sun or other celestial body;For values of

*z*less than about 70°, Bemporad's formula can be replaced by the simpler approximate formula,List, R. J., ed. 1951. Smithsonian Meteorological Tables. 6th rev. ed., . p. 422.