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    Re: Moon Occultation of Jupiter
    From: Fred Hebard
    Date: 2004 Dec 2, 22:15 -0500

    On Dec 2, 2004, at 7:30 PM, in discussing the surface brightness of the
    moon at various phases, George Huxtable wrote:
    
    > But the recent Jupiter occultation of November 9th, which Frank was
    > presumably taking as his example, occurred 5.5 days after Moon's last
    > quarter, which was on Nov 5th. The Moon must have appeared as a faint
    > thin
    > crescent. By that time the Moon's phase had changed through 70
    > degrees, and
    > the direction of sunlight falling on the limb had changed by the same
    > amount; so the resulting brightness at the Moon's surface would then
    > be 4.4
    > cos 70, or about 1.5 times as bright as the surface brightness of
    > Jupiter.
    
    I wonder whether the non-level surface of the moon --there are craters,
    etc-- would alter the brightness, perhaps making it less variable with
    changes in sun angles.  Alternatively, I suppose, integrating over the
    various surface angles might give the same brightness as if the moon's
    surface were smooth.  I would guess the surface brightness might have
    been measured fairly thoroughly by astronomers?
    
    Fred
    
    
    

       
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