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

Lizeth Norman normanlizeth at gmail.com
Tue Oct 27 13:38:47 EDT 2015


Nothing beats an E6-B on your wrist. Lots of people have them. Very
few of them know. Great way to have fun at a dinner party.
"Pardon me madam: That's an elegant slide rule you have!"

On Mon, Oct 26, 2015 at 9:23 PM, Graham / KE9H <ke9h.graham at gmail.com> wrote:
> 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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