apparent magnitude

apparent magnitude
: the observed or apparent brightness of a celestial body expressed on the magnitude scale and varying in accordance with the spectral sensitivity of the means of observing (as the eye, a photographic material, or an instrument)

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ˌapparent ˈmagnitude 7 [apparent magnitude] noun uncountable (astronomy)
a measure of how bright a star, planet, etc. is, as it is seen from the earth

Useful english dictionary. 2012.

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