A microcomputer program to predict sunburn exposure

A simple microcomputer program written in BASIC calculates the time that can be spent in the sun without risk of sunburn. Seven data are requested by the computer: (1) the month, (2) the weather conditions, (3) the subject's complexion, (4) the subject's activity outdoors, (5) the sun protection factor if a sunscreen is used, (6) the latitude on the Earth's surface, and (7) the time of day at which sun exposure begins. The calculated "safe exposure time" is an estimate for the time to give a minimal erythema dose--a just visible sunburn.