The radiation of any celestial object is characterized by the luminous flux or illumination, measured respectively in watts

The radiation of any celestial object is characterized by the luminous flux or illumination, measured respectively in watts or watts per square meter (SI). Why do astrophysics also use magnitude and magnitude?

The concept of brilliance arose in astronomy before the physical concepts of “luminous flux” and “illumination” appeared. Stellar magnitudes are a logarithmic measure of illumination and reflect the physiological characteristics of the perception of light by the human eye. To study the physical characteristics of space objects, of course, it is necessary to know the illumination, measured, for example, in watts per square meter.

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