Air Mass (AM) – Definition, Glossary, Details – Solar Mango

The Air Mass (AM) is the path length which light takes through the atmosphere normalized to the shortest possible path length (that is, when the sun is directly overhead). The Air Mass quantifies the reduction in the power of light as it passes through the atmosphere and is absorbed by air and dust. The Air Mass is defined as: 1/cos(θ) where θ is the zenith angle.

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