Natural Radiance

Nature

Nature, in the broadest sense, is the physical world or universe. In this general sense nature refers to the laws, elements and phenomena of the physical world, including life. Although humans are part of nature, human activity or humans as a whole are often described as at times at odds, or outright separate and even superior to nature.

Radiance

In radiometry, radiance is the radiant flux emitted, reflected, transmitted or received by a given surface, per unit solid angle per unit projected area. Radiance is used to characterize diffuse emission and reflection of electromagnetic radiation, and to quantify emission of neutrinos and other particles. The SI unit of radiance is the watt per steradian per square metre. It is a directional quantity: the radiance of a surface depends on the direction from which it is being observed.

natural

Adjective

1. Existing in nature.

Noun

1. A native inhabitant of a place, country, etc.
2. A note that is not or is no longer to be modified by an accidental.

radiance

Noun

1. The quality or state of being radiant; shining, bright or splendid.
2. The flux of radiation emitted per unit solid angle in a given direction by a unit area of a source.