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Magnitude. The degree of brightness of a star or other object in the sky according to a scale on which the brightest star has a magnitude -1.4 and the faintest visible star has magnitude 6. Sometimes referred to as apparent magnitude. In this scale, each number is 2.5 times the brightness of the previous number. Thus a star with a magnitude of 1 is 100 times brighter than on with a visual magnitude of 6.
Apparent magnitude. (Apparent brightness) How bright a star appears to be, depends on how much light the start emits & how far away it is. -decreases inversely w/ the square distance between the sun and the observer. -for two identical starts, if one is twice as far away it is 1/4 as bright. Absolute magnitude.