#albedo

• Albedo — A physical quantity representing the ratio of light energy reflected by a surface to the incident energy upon it, expressed as a fraction or percentage; an indicator of the reflective capacity of celestial bodies, snow, or soil. In botany, the term denotes the inner, white, spongy, and fibrous layer of the peel of citrus fruits (located under the flavedo), rich in pectin and bitter substances.
• Albedometer — A precision meteorological instrument consisting of two coupled pyranometers (one facing upward and one downward), used for the direct measurement of a surface's albedo by simultaneously determining global solar radiation and that reflected by the ground.