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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