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.
