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- Dictionaryapparent magnitude
noun
- 1. the magnitude of a celestial object as it is actually measured from the earth.
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noun
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Apparent magnitude is a measure of the brightness of a star, astronomical object or other celestial objects like artificial satellites. Its value depends on its intrinsic luminosity, its distance, and any extinction of the object's light caused by interstellar dust along the line of sight to the observer. Wikipedia