The Langley ( unit symbol: lan or ly) is a named after the American astrophysicist Samuel Pierpont Langley Anglo-American unit of irradiation. It can be used, for example, in the indication of the incident in a day in one location on the surface of solar energy.
1 lan = 1 calth / cm ² = 41 840 Joules / meter ²
- Anglo-American unity
- Astronomical unit