apparent magnitude

English

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Noun

apparent magnitude (countable and uncountable, plural apparent magnitudes)

  1. (astronomy) a numerical measure of the brightness of a star, planet etc.; a star with apparent magnitude 0 gives an illuminance of 2.54 microlux just outside the earth's atmosphere, or 82% of that (2.08 microlux) under clear skies, and every increase of 1 unit represents a decrease in the light received by a factor of 2.512.

Translations

measure of the brightness of a heavenly body
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