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    Re: Anyone know about this?
    From: Lu Abel
    Date: 2007 Nov 26, 19:28 -0800

    Ignoring issues like the actual visibility of bodies, etc, it would seem
    to me to be possible to develop a device like this.   Man-made
    satellites have included positioning systems that use celestial "sights"
    for satellite orientation for decades.  My understanding is that they
    obtain arc-second accuracy.
    Lu Abel
    Fred Hebard wrote:
    > Hopefully, Paul Hirose will jump in here.  To my understanding,
    > they've had these gadgets for a while now.
    > On Nov 24, 2007, at 8:47 PM, Guy Schwartz wrote:
    >>I was bopping around the USNO web site and ran across this:
    >>Celestial Navigation
    >> A device that automatically observes stars, day or night, with
    >>respect to the local gravity vector (i.e., the true "down"
    >>direction), could provide a high-precision location and attitude
    >>solution for ships and aircraft, independent of GPS. Two prototype
    >>units with different designs have been constructed, one that
    >>operates in the far-red optical part of the spectrum, the other in
    >>the near-infrared. Accuracies better than 100 meters in position
    >>and several arcseconds in attitude should eventually be achievable
    >>with such devices. This project is jointly managed by the U.S.
    >>Naval Observatory in Washington and the Navy's SPAWAR System Center
    >>in San Diego. The prototype units were built by two California
    >>contractors. A follow-up device is being built for surveying
    >>applications (fixed points on land) by one of the contractors,
    >>funded by the National Geospatial-Intelligence Agency (NGA). The
    >>feasibility of using similar devices to precisely align Navy Aegis
    >>ship radar is also being investigated.
    >>The navigation software for the project is based on some innovative
    >>algorithms for celestial navigation developed at the Naval
    >>Observatory about a decade ago. These algorithms are based on the
    >>solution to a familiar astronomical problem - determining the orbit
    >>of a body from a series of observations. In this case, the body in
    >>question is a ship and its "orbit" is a rhumb-line track over the
    >>spheroidal surface of the Earth.
    >>Anyone know anything about it or if it works:
    >>No virus found in this outgoing message.
    >>Checked by AVG Free Edition.
    >>Version: 7.5.503 / Virus Database: 269.16.6/1150 - Release Date:
    >>11/24/2007 5:58 PM
    > >
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