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

Scott McGrath scmcgrath at gmail.com
Mon Oct 26 12:52:23 EDT 2015


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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