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The full-moon disc appears uniformly bright because it has an irregular surface: it is not billiard-ball smooth.Mountains at the centre of the disc are viewed from above,Mountains at the edge of the disc are seen side-on which reflect more light ...[attachment=18979]Counteracting the fall-off in light-intensity towards the edge that would occur on a smooth sphere.
A basketball has more irregular surface than the moon, seems the edge looks darker under flash light?
Quote from: jccc on 13/07/2014 14:57:54A basketball has more irregular surface than the moon, seems the edge looks darker under flash light?Is the flash-light "sun" placed at 40,000 baseball-diameters from the baseball ? If the flash-light "sun" is close to the ball there will be more noticeable fall-off in brightness due to the increased distance the light has to travel to the edge , (~ the radius of the ball, which is more significant than you may think due to the Inverse square law ).
I double tested, you nailed it.
Quote from: jccc on 13/07/2014 18:31:09I double tested, you nailed it.Excellent - someone who's prepared to test the claim - top marks!In fact, top marks for the whole thread.