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The apparent magnitude (AM) [See Link] is a measure of its brightness as seen by an observer on Earth, in the absence of the atmosphere. The brighter the object appears, the lower the value of its magnitude.

The Sun has an AM of -26.73 whereas a full Moon has an AM of -12.6.

The scale is logarithmic: the relative brightness of two objects is determined by the difference of their magnitudes. Pogson's Ratio was suggested in 1856 so that each decrease in magnitude represented a decrease in brightness equal to the fifth-root of 100 (or about 2.512)

So, the difference in magnitude is (-12.6) - (-26.73) giving 14.13

Thus 2.51214.13 = 449,032.

Close enough to half a million.

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