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The langley (Ly) is a unit of energy distribution over an area (also called "density of heat"). It is used to measure solar radiation (or insolation). The unit was named after Samuel Pierpont Langley (1834-1906) in 1947.
One langley is
- 1 thermochemical calorie per square centimetre, i. e.
- 41840 J/m² (joules per square metre),
- ca. 11.622 watt-hours per square metre.
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