Duration of Sunshine
The amount of time sunlight was detected at a given point.
DURG ...
Heliograph An instrument which records the duration of sunshine and gives a quantitative measure of the amount of sunshine by the action of the sun's rays upon blueprint paper. A type of sunshine recorder.
ISOHEL A line drawn through geographic points having equal duration of sunshine or another form of solar radiation during a specified time period.
It is the ratio of the actual duration of bright sunshine (unobstructed sunlight measured by a sunshine recorder) in hours and minutes compared to the astronomically possible duration of sunshine in hours and minutes, from sunrise to sunset, ...
 See also: Cloud, Precipitation, Atmosphere, Temperature, Ice Crystals
  
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