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    Re: It's Moon-landing Monday
    From: Peter Hakel
    Date: 2009 Jul 21, 09:10 -0700
    The software for processing of observed crater sizes would have to account for the crater's "zenith distance" from the spacecraft's selenoghraphic position.  That is, one has to worry about the tilt of the crater's rim and the resulting reduction of its apparent cross section and size.  This would become more important the closer you are to the Moon.  The good news there, I think, is that at that point it may be realistic to measure crater shadows, which would provide additional information.  Unless, of course, it's full moon...

    Peter Hakel

    From: "frankreed{at}HistoricalAtlas.com" <frankreed{at}HistoricalAtlas.com>
    To: NavList@fer3.com
    Sent: Tuesday, July 21, 2009 12:54:43 AM
    Subject: [NavList 9160] Re: It's Moon-landing Monday

    Yes, that would work. The Moon would loom awfully large from 900 miles above the surface. Could you measure it through the small windows typical on spacecraft? You could do something similar with a couple of small, prominent craters. Presumably you have detailed lunar topography (it's 2029 after all), so you could ask your software to compute the exact angles between some craters beneath your trajectory for the correct altitude.

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