Synonym(s)
shadow rule
DefinitionThis section has been translated automatically.
Empirical rule for estimating the intensity of sunlight-induced UV radiation and the associated need for light protection measures by patients for their own use. It is based on the fact that high sun causes short shadows and low sun causes longer shadows. This applies to all geographical regions and all times of the day and year. Therefore, long shadows = weak sunshine or short shadows = strong sunshine. If the shadow is as long as the body height, this corresponds to an angle of incidence of 45° or a UV index of 3.
LiteratureThis section has been translated automatically.
- Downham TF 2nd (1998) The shadow rule: a simple method for sun protection. South Med J 91: 619-623
- Sliney DH et al (2006) Is a differentiated advice by season and region necessary? Prog Biophys Mol Biol 92: 150-160
Prof. Dr. med. Peter Altmeyer