A lambertian radiating surface is one whose intensity varies with angle according to Lambert's Law. The radiance of a lambertian radiating surface is independent of the angle from which it is viewed....A lambertian radiating surface is one whose intensity varies with angle according to Lambert's Law. The radiance of a lambertian radiating surface is independent of the angle from which it is viewed. Lambertian surfaces radiate isotropically. The radiance of a black body is lambertian. Since the Sun exhibits limb-darkening; the Sun is not a black body, nor is it lambertian.
