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

Graham / KE9H ke9h.graham at gmail.com
Mon Oct 26 21:23:45 EDT 2015


Both the sextant and the slide rule will still function after an EMP event.
Not much other electronic stuff will.
--- Graham / KE9H

==

On Mon, Oct 26, 2015 at 4:20 PM, paul swed <paulswedb at gmail.com> wrote:

> Crazy bit of humor/timing in all of this I guess.
>
> Oddly at the last MIT flea I picked up a very nice astro-compass including
> case and manual. Also a news clipping that the Navy was restarting training
> on celestial navigation. Now I just need to add a mount to the car dash
> board.
> All prepared for the day the Glenda GPS fails.
>
> By the way if its celestial navigation, next will be slide rules. Pretty
> hard to tamper with them. The only virus they get are cold.
> Regards
> Paul
> WB8TSL
> Sorry really going astray here.
>
> On Mon, Oct 26, 2015 at 12:52 PM, Scott McGrath <scmcgrath at gmail.com>
> wrote:
>
> > Or with the appropriate filters you can shoot the sun with a sextant like
> > the old time Mariners did
> > I still have a sextant and still use it along with a copy of Bowditch
> >
> > Content by Scott
> > Typos by Siri
> >
> > > On Oct 26, 2015, at 9:13 AM, Jim Lux <jimlux at earthlink.net> wrote:
> > >
> > >> 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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