NavList:

   

Reply

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
> >
> >
> >


--~--~---------~--~----~------------~-------~--~----~
Navigation List archive: www.fer3.com/arc
To post, email NavList@fer3.com
To unsubscribe, email NavList-unsubscribe@fer3.com
-~----------~----~----~----~------~----~------~--~---

   

Reply