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    Re: Lunars: Jupiter's BIG.
    From: Fred Hebard
    Date: 2003 Dec 24, 11:49 -0500

    George certainly manages to mangle the last consonant in my surname in
    some interesting ways!
    Jan Kalivada recently posted some data from a German publication.  Now
    I am sure they were taken from steam-powered ships, but I wonder how
    different it would have been from the quarterdeck of Nelson's Victory
    or similar large sailing ships.  There have been some posts on list
    list about lunars from masters of some of the sail training ships,
    which should be relevant, as opposed to experience on small yachts.
    Fred Hebard
    On Dec 24, 2003, at 11:14 AM, George Huxtable wrote:
    > Fred Hebarf wrote-
    >> In answer to various claims about the accuracy of lunars, it would
    >> seem
    >> to me that the error in lunars should approach the precision of the
    >> sextant, given enough measurements of decent quality and decent
    >> reduction procedures.  That would be 0.1 to 0.2' of arc, or 12-24
    >> seconds.
    > That may be what Fred can reliably achieve on land, with a stable
    > platform
    > beneath his feet. It's rather better than could be expected at sea, in
    > the
    > size of vessel that was used in the heyday of lunars.

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