Editing Direct insolation (section)

{{disputed|date=November 2017}}
'''Direct insolation''' is the [[insolation]] measured at a given location on [[Earth]] with a surface element [[perpendicular]] to the [[Sun's ray]]s, excluding [[diffuse sky radiation|diffuse insolation]] (the solar radiation that is [[scattering|scattered]] or [[reflection (physics)|reflected]] by atmospheric components in the [[sky]]). Direct insolation is equal to the [[solar irradiance]] above the atmosphere minus the atmospheric losses due to [[absorption (electromagnetic radiation)|absorption]] and scattering. While the solar irradiance above the atmosphere varies with the Earth&ndash;Sun distance and [[solar cycle]]s, the losses depend on the time of day (length of light's path through the atmosphere depending on the [[solar elevation angle]]), [[cloud cover]], [[humidity]], and other [[air pollution|impurities]].