Under An Overcast Sky
There is essentially no direct sunlight under an overcast sky, so all light is then diffuse sky radiation. The flux of light is not very wavelength dependent because the cloud droplets are larger than the light's wavelength and scatter all colors approximately equally. The light passes through the translucent clouds in a manner similar to frosted glass. The intensity ranges (roughly) from 1⁄6 of direct sunlight for relatively thin clouds down to 1⁄1000 of direct sunlight under the extreme of thickest storm clouds.
Read more about this topic: Diffuse Sky Radiation
Famous quotes containing the word sky:
“The temples, the tank, the jail, the palace, the birds, the carrion, the Guest House, that came into view as they issued from the gap and saw Mau beneath: they didn’t want it, they said in their hundred voices, “No, not yet,” and the sky said, “No, not there.””
—E.M. (Edward Morgan)