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Pogson scale

A Dictionary of Astronomy | 1997 | 353 words | Copyright

Pogson scale The standard scale of magnitude, which was formulated mathematically by N. R.Pogson in 1856. He proposed that a difference of 5 magnitudes should be defined as corresponding to a difference of exactly 100 in the intensities of the stars concerned. A difference of 1 magnitude therefore corresponds to the fifth root of 100, which is 2.512.

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