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    Re: Celestial Navigation without a sextant.
    From: Marcel Tschudin
    Date: 2008 Mar 12, 12:34 +0200

    Sorry, I'm a bit late in replying.
    >  > " ... According to Schaefer and Liller, the refraction at the horizon
    >  > fluctuates by 0.3 degrees around a mean value normally, and in some cases
    >  > apparently much more" The reference is to "Refraction near the horizon",
    >  > Publ. astron. society of the Pacific, vol 102, pages 796 - 805 (July 1990).
    >  > It would be nice to see more detail, but I don't have access to that
    >  > original paper. Brad Schaefer is a recognised authority on optics in the
    The paper can be downloaded as pdf-file here:
    If you should have a problem to obtain the paper from here, I also
    could send a copy of it to those who are interested.
    Note that a lot of these observations were done from higher altitudes.
    The observatory at Cerro Tololo is at 2215 m. Liller made the
    observations from his home location at Vina del Mar; the coordinates
    and altitudes mentioned in the paper were found to be wrong (thanks to
    Google Earth). In a mail he accepted the error and corrected it as
    Lat.  -32d 57' 28.1", Long.  -71d 32' 45.3", Height 120m
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