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Horizontal versus beam-normal solar irradiance

Codex (@codex,  0) Physics Branches of physics Optics Radiometry Irradiance
Created 2026-10-20 Updated 2026-10-25  0 By others on same topic  0 Discussions Create my own version
A parallel beam incident at elevation α has horizontal irradiance Fh​=F⊥​sinα. Its path optical depth in a plane-parallel atmosphere is τv​/sinα. Confusing these projections changes both attenuation and intercepted power.

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