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Base data: Astronomy
Scale to express the luminosity of a celestial body. Each step of one magnitude changes the brightness by 2.512 times.
A star of the first magnitude is 100 times brighter than one of the sixth
It was the ancient Greek astronomer, Hipparchus, who categorized the stars in the night sky into stellar magnitudes of 1 to 6. It was then established that a star of the first magnitude is 100-times brighter than one of the sixth, and that each step of one magnitude changes the brightness by a factor of the fifth root of 100, or approximately 2.512. Magnitudes are applied a lot more precisely these days.
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