ajavahemik, mille jooksul otsese päikesekiirguse kiirgustihedus päikese suuna suhtes risttasapinnal on võrdne või suurem kui 120 W·m−2
duration within a given time interval during which the irradiance from direct solar radiation on a plane normal to the sun direction is equal to or greater than 120 W·m−2
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