[time-nuts] Celestial Navigation instruction being reinstated in the US Navy

[Jim Lux]

On 10/25/15 9:37 AM, jim s wrote:
>
> Somewhat time related.  The Navy realizes that GPS might not always
> work.  I don't imagine that aircraft in the US Air Force will be able to
> do this very reliably, and the article doesn't mention that service. I'm
> guessing that a lot of strategic Air Force aircraft have star trackers
> that will work some of the time w/o GPS (at night).
>

There's an excellent set of CD-ROMs with about 50 papers on celestial 
nav and time keeping from the Institute of Navigation.

https://www.ion.org/publications/upload/CelestialNavTOC.pdf

Papers in there about all manner of star trackers and celestial nav, 
from prehistory through the Renaissance era, to modern computerized 
celestial nav boxes, etc.

$50, as I recall.

Celestial nav during the daytime isn't all that hard, if you have a 
suitable telescope.  With a 28x telescope on a theodolite, you can see 
Polaris, for instance.  The trick is in finding it first.



> http://www.latimes.com/nation/la-na-celestial-navigation-20151025-story.html
>
>
> Thanks
> Jim
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