NavList:

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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