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 <[email protected]> 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 <[email protected]> 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 <[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. >> > _______________________________________________ > 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.
