brightness

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Finally, a comparison with the apparent brightness as seen from Earth shows how far away it must be.
For most eyes, the apparent brightness of light entering at the edge of the pupil is reduced by a factor of five compared with light entering at the position of greatest efficiency.
Magnification and exit pupil size both affect apparent brightness and sharpness, so to truly compare the optical quality of different scopes the magnification must be the same.
The only apparent brightness to his persona is a well-publicised sentimentality and a love of music.
The relation of apparent brightness to contrast threshold on a photopic background: Dependence on retinal position and size.
Comparing this with the apparent brightness as seen from earth enables scientists to work out how far away it is.