Definition: Angle of incidence
From Open Energy Information
Angle of incidence
In reference to solar energy systems: the angle a ray of sun makes with a line perpendicular to a surface; for example, a surface directly facing the sun has an angle of incidence of zero, and a surface parallel to the sun (such as a sunrise striking a horizontal rooftop) has an angle of incidence of 90°. Sunlight with an incident angle of 90° tends to be absorbed, while lower angles tend to be reflected.[1][2]
References
- ↑ http://www1.eere.energy.gov/site_administration/glossary.html
- ↑ http://www1.eere.energy.gov/solar/solar_glossary.html#C