# Bemporad's formula

From AMS Glossary

## 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.