[From sun to earth].

Rev Med Liege

CHU du Sart Tilman, Service de Dermatopathologie, Liège.

Published: July 2005

Sun emits a vast array of electromagnetic radiations. After a long but fast journey, the spectrum of visible and ultraviolet light, and infrared radiations reaches the furthermost boundaries of the Earth. Only a fraction of them reaches the biosphere. Photogeoclimatology primarily depends on this energy and is modulated by the latitude, soil relief, seasons and nycthemeral cycle.

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