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    Re: Plot of my lunar errors
    From: Greg Rudzinski
    Date: 2013 Jul 31, 09:19 -0700


    A quick glance at your lunar sets shows what looks to be a few fliers with errors over 2' minutes of arc. There also looks to be a dozen or so observations off by a minute from the majority of the observations. The one minute of arc spread for the majority of the observations between 20° to 120° is an acceptable result for a metal sextant (+/- 0.5').

    If you are using a split horizon mirror then be sure the silvered edge of the mirror splits the objective lens of the scope. Sometimes with prismatic scopes they just look as if they are not parallel to the frame when they are. If conditions are windy during observations then expect errors to have a larger spread. Lens fogging is something to be aware of. Don't wipe the lens when fogged but just pull the sextant away from the eye and wait for the lens to clear naturally.

    Greg Rudzinski

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