Langley (unit)

The langley (Ly) is a unit of energy distribution over area. It is used to measure solar radiation (or insolation). The unit was named after Samuel Pierpont Langley (1834-1906) in 1947.

Definitions

• One langley is one thermochemical calorie per square centimetre.
• In SI units, one langley is 41840.00 J/m² (or joules per square metre).
• In more common units, one Langley is 11.622 watt-hours per square metre.^[1]

References