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Old 07-12-2005, 05:54 AM   #60 (permalink)
She-Who-Is-Not-To-Be-Psycho!
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"The apparent magnitude of a star, planet or other heavenly body is a measure of its apparent brightness; that is, the amount of light received from the object.
"One hundred times less bright (e.g. the same object ten times as far) corresponds to an apparent magnitude that is five more; 2.512 times less bright (e.g. the same object 1.585 times as far) corresponds to an apparent magnitude that is one more, 2.512 being the fifth root of 100 (1000.2)."
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