Global Distribution of Solar and Sky Radiation
It is quite appropriate that sunshine maps should accompany an atlas of diseases. Of all the climatic elements sunshine is the only one for which both direct and indirect effects on health have become conclusively proven. We need to point only to the relations of sunshine to tanning of the skin, to erythema, to rickets and to skin cancer to make this clear. The therapeutic value of sunshine for many diseases, skin ailments, rheumatoid arthritis, and other muscular-skeletal diseases has often been cited. It has been even indicated as a factor in the incidence of multiple sclerosis.
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