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    Re: Reality check
    From: Greg R_
    Date: 2006 Jun 6, 15:03 -0700
    Red wrote:

    > If we start with knowing the sun's rising position and altitude will vary
    > by a fixed number of degrees and days, and divide out, we already can
    > get some information simply by observing sunrise and noon, no batteries needed.


    Well, I can see how that might give you a date (though my example assumes we know that already), and a latitude (which could also be determined within a degree or so without any other references or paperwork by a Polaris shot, at least in the Northern Hemisphere).

    > Or perhaps, that topic belongs in another forum, one for "instrument
    > free navigation for real celestial navigators"


    Yeah, I think the Polynesians were on to something... I may dive into that area once I get my celnav skills up to where I can get consistently good fixes. I got a nice sun/moon cross at the beach over the weekend with 0.2 NM intercepts (to a known GPS position) - don't know if I can pull off that kind of accuracy on a consistent basis, but the Astra is sure proving itself to be a fine precision instrument to work with.  :-)

    --
    GregR

    ----- Original Message ----
    From: Red <hellosailor@VERIZON.NET>
    To: NAVIGATION-L@LISTSERV.WEBKAHUNA.COM
    Sent: Tuesday, June 6, 2006 10:57:19 AM
    Subject: Re: Reality check

    ""So if I blindfolded you and dropped you off anywhere in the world, you could figure out where you are just from celestial?"). "
     
    Greg, I suspect the answer would be "YES!" even though the position circle might be somewhat larger than ten feet, and a clear night sky might be of use.<G>
     
    If we start with knowing the sun's rising position and altitude will vary by a fixed number of degrees and days, and divide out, we already can get some information simply by observing sunrise and noon, no batteries needed.
     
    Or perhaps, that topic belongs in another forum, one for "instrument free navigation for real celestial navigators".<G>
       
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