%0 Journal Article %J Applied Optics %D 1989 %T Revised optical air mass tables and approximation formula %A Fritz Kasten %A Andrew T. Young %B Applied Optics %I OSA %V 28 %P 4735–4738 %8 11/1989 %G eng %U http://ao.osa.org/abstract.cfm?URI=ao-28-22-4735 %R 10.1364/AO.28.004735