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    Re: Extinction
    From: Gary LaPook
    Date: 2014 Feb 4, 14:27 -0800
    I thought of that too but the sun had set two hours earlier so it was past astronomical twilight.

    gl



    From: Geoffrey Kolbe <geoffreykolbe---.com>
    To: garylapook---.net
    Sent: Tuesday, February 4, 2014 2:48 AM
    Subject: [NavList] Re: Extinction


    Hello Gary
    
    The brightness at which you can no longer see an object depends on the
    ambient light level. So, you will get a different result at night.
    
    --
    Dr Geoffrey Kolbe, Riccarton Farm, Newcastleton, TD9 0SN
    Tel: 013873 76715 Mob: 07811 154621
    
    
    View and reply to this message: http://fer3.com/arc/m2.aspx?i=126786


       
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