What is a sun photometer?
A Sun photometer (or sunphotometer) is a kind of light meter that measures the light from the Sun. Most Sun photometers measure sunlight at discrete colors or wavelengths. All Sun photometers measure only the sunlight arriving directly from the Sun and not the sunlight scattered from MOLECULES and AEROSOLS (or particles) in the sky. Therefore a Sun photometer must be pointed directly at the Sun.
