Friday was three weeks since the solstice, and daylight has become a full minute shorter, suggesting that summer, while long and hot, may not be endless.

Meadowlarks, robins and vesper sparrows greeted the dawn, each exhalation of their voices adding a quantum of mist to that in ...

Cloud cover significantly affects the solar irradiance incident on a photovoltaic (PV) module, so identifying and predicting cloud motion is useful for PV applications, such as informing tracker ...