Albedo (from the Latin word for “whiteness”) is a dimensionless measure of how much incoming solar radiation a surface reflects. In solar, albedo affects ground-reflected irradiance reaching tilted and bifacial panels. It is measured on a scale from 0 (corresponding to a black body that absorbs all incident radiation) to 1 (corresponding to a body that reflects all incident. Albedo is the fraction of solar energy (shortwave radiation) reflected from the earth back into space. It is an important consideration in climatology since recent albedo decreases in the Arctic have increased heat absorption.