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 <[email protected]> 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 <[email protected]> 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 > >> _______________________________________________ > >> time-nuts mailing list -- [email protected] > >> To unsubscribe, go to > >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >> and follow the instructions there. > > > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
