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Mr. Burkes-The same method is used. In rough seas, a prism level attached to your sextant is a handy tool, but a luxury. I seem to need other things more. "Swing your arc, then holler mark", was the the adage my mentor, God rest him, drilled into my brain.-Jim W.

> Date: Tue, 1 Apr 2008 17:18:21 -0700
> Subject: [NavList 4782] Lunar and Solar upper limb observations and cel nav videos
> From: m_burkes@msn.com
> To: NavList@navlist.net
>
>
> Hi folks 2 questions to pose:Most nav texts discuss lower and upper
> limb obs but the "swinging the arc" diagrams and explanations only
> pertain to lower limb. I probably am missing something obvious but can
> you folks describe the upper limb "swinging the arc"procedure, i.e.,
> point of tangency, etc?
> In this day and age of computer generated animations I have only been
> able to find a very limited no.of cel nav videos, namely Mr. Buckley's
> and a Magic Lamp one and about 40 dollars price. They are very well
> presented but limited to solar obs( probably lower limb obs!). It
> would be pretty cool to see lunar distance, interstellar angles,
> twilight star and planet obs in video presentation. If anyone has info
> on this it would be greatly appreciated. Thanks much.
> Mike Burkes
> m_burkes@msn.com
> 626-833-1521
>
>
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