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Information About

Langley (unit)




The langley (Ly) is an international unit used to measure Solar Radiation (or Insolation ). The unit was named after Samuel Pierpont Langley ( 1834 - 1906 ) in 1947 .


DEFINITION

One langley is exactly 1 Thermochemical Calorie per Square Centimetre . In SI Unit s, 1 langley is exactly 41840.00 J/m&2 (or Joule s per Square Metre ).