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    Re: The Moon and bubble sextant
    From: Jean-Philippe Planas
    Date: 2008 Nov 11, 00:44 -0800
    Yes,  my average is also typically in the 5 to 10 NM range with a bubble sextant.
    JPP



    --- On Sun, 11/9/08, bruce hamilton <bruce.hamilton@shaw.ca> wrote:
    From: bruce hamilton <bruce.hamilton@shaw.ca>
    Subject: [NavList 6480] Re: The Moon and bubble sextant
    To: NavList@fer3.com
    Date: Sunday, November 9, 2008, 9:59 PM

    That was with the A10. The Mark IX is still lacking a  bubble, and I 
    need to get in to work to use the shop to fill it. BTW I assume there
    was a LOT of luck with those 2 moon sites. I am lucky to get a 10 mile
    error with stars. My average is 5 to seven miles.

    jean-philippe planas wrote:
    > Was that with your new MkIX or with the A10?
    > JPP
    >
    >
    >
    > --- On *Sun, 11/9/08, bruce hamilton /<bruce.hamilton@shaw.ca>/*
    wrote:
    >
    > From: bruce hamilton <bruce.hamilton@shaw.ca>
    > Subject: [NavList 6475] Re: The Moon and bubble sextant
    > To: NavList@fer3.com
    > Date: Sunday, November 9, 2008, 1:17 PM
    >
    > Thanks Mike that worked well, and I tried another method that I would
    > like to know if anyone else has had luck with. I put the lower limb in

    > the center of the bubble. (My AP is my actual position on earth.)First

    > result the LOP .3 NM from AP second try was 1.1 NM from AP. My luck
    > factor was very high last night! I wish I had taken the a-12 out too.
    >
    > Mike Burkes wrote:
    > > Hi Bruce, Air
    > Almanac not necessary for Moon corrections. Refer to
    > > Nautical Almanac page xxxiv after the "Increments and
    > Corrections"
    > > Table and I quote:" For bubble sextant observations ignore
    dip, take
    > > the mean of upper and lower limb corrections and subtract 15'
    from the
    >
    > > altitude." Hope this helps, have fun I know I do! I also
    have an A-10
    >
    > > and my only complaint is lack of total sun filtering,i.e. the
    > > potential for eye damage is possible so be careful.
    > > Mike Burkes
    > > 626-833-1521
    > >
    > > > Date: Sat, 8 Nov 2008 22:30:46 -0800
    > > > From: bruce.hamilton@shaw.ca
    > > > To: NavList@fer3.com
    > > > Subject: [NavList 6465] The Moon and bubble sextant
    > > >
    > > >
    > > > I have never shot the moon with my bubble sextants and it is
    the only
    > > > body that is peeking out from the gloom tonight. It is quite
    handy
    > > > actually
    > as it peers through quite a lot of cloud and a light filter
    > > > sharpens it up nicely. As I am sure all of you understand, I
    have to
    > > > make sure that my balcony has not changed location on the
    face of the
    > > > earth. I do not own an Air Almanac yet, and I was wondering
    if it
    > > > contained correction tables for the moon and sun that were
    made for a
    > > > bubble sextant. With the sun, I just use the star
    corrections, or
    > > > average the upper and lower limb.
    > > >
    > > > I just got a Mark IX on e-bay for 31 dollars. It is missing
    the cover
    > > > for the averaging clockwork system, and I will have to fill
    the
    > bubble
    > > > system, but it is otherwise fine. I found a reference to a
    page on
    > this
    > > > list that gives me all the details I need to remove and fill
    the
    > bubble
    > > > mechanism.
    > > >
    > > > I now own an A-12, and A-10, and the Mark IX.
    > Can I stop collecting
    > now?
    > > >
    > > > Bruce Hamilton
    > > > Vancouver, BC
    > > > CN89kg
    > > >
    > > >
    > > >
    >
    >
    >
    >
    >
    > >
    >
    >
    >
    >
    >



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