langley
n. countablen. a unit used to measure how much solar energy hits a specific area on Earth. It is mostly used by scientists who study the sun and the weather.
n. a unit of solar radiation intensity equivalent to one gram calorie per square centimetre of irradiated surface. Primarily used in meteorology and solar physics to quantify insolation.
The sensor measures the langleys of solar energy hitting the field.
Meteorologists recorded the daily langleys to determine if the solar panels were operating at peak efficiency during the summer.
The total solar radiation received at the surface was expressed in langleys to facilitate a direct comparison with historical climate data from the mid-twentieth century.
Named after Samuel Pierpont Langley; often used in the plural when discussing cumulative measurements over time.