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- Langley unit

	Categories: Units of measure 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: $1\ {\rm ly} = \frac{1\ {\rm cal}}{{\rm cm}^2}.$ Categories: Units of measure

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Langley unit