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`E_v = 10^((-14.18 - M_v)/2.5`

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This equation computes the apparent magnitude (`M_v`) from the input illuminance (`E_v`) input as units of lux (lx).

Illuminance is the measure of the amount of light (luminous flux) incident on a surface.

Apparent Magnitude is a measure of a celestial body's brightness as seen by an observer on Earth. The Apparent Magnitude is adjusted to the value it would be in the absence of atmosphere.