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    Re: Irradiation and manual navigation
    From: Henry Halboth
    Date: 2010 Mar 11, 21:50 -0800
    Hi all,

    Isn't it really amazing how we seem to keep re-inventing the wheel. Didn't our "land bound" Professor Chauvenet give us the exact same number, i.e., +/- 10 arc seconds, in an 1868 paper on Astronomy - admittedly, however, he doesn't mention the matter of irradiation. Most of this stuff can be found in the literature of yesteryear.

    Just a thought -:).



    --- On Thu, 3/11/10, Richard M. Pisko <rmpisko1@telus.net> wrote:

    From: Richard M. Pisko <rmpisko1@telus.net>
    Subject: [NavList] Re: Irradiation and manual navigation
    To: NavList@fer3.com
    Date: Thursday, March 11, 2010, 11:01 PM

    On Sun, 07 Mar 2010 12:45:12 -0700, Douglas Denny <douglas.denny@btopenworld.com> wrote:

    > The results of approximately 1200 measurements made during nine flights confirm results of simulator and groundbased studies which indicate that, with a hand-held sextant, an astronaut can be expected to make navigational measurements with errors having a standard deviation of approximately +/- 10 arc seconds.
    > A value for moon irradiance effect of approximately 25 arc seconds was established for the conditions of the experiment using a hand-held sextant.
    > ENDS.

    To me, this 1/2 minute of arc seems reasonable.  Thank you for your further research.

    --Richard . . .

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