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A · B · C · D · E · F · G · H · I · J · K · L · M · N · O · P · Q · R · S · T · U · V · W · X · Y · Z   entire Web this site global insolation The total direct insolation and diffuse insolation striking a horizontal surface, averaged over a specified period of time. Note that diffuse and direct-normal sunlight generally have different energy spectra or distributions of color. Related category    • SOLAR ENERGY AND POWER Also on this site: Encyclopedia of Science Transport Concepts & Designs (partner site) BACK TO TOP