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    Re: Lunars using Bennett
    From: Ken Muldrew
    Date: 2008 Jul 03, 14:39 -0600

    On 3 Jul 2008 at 21:27, George Huxtable wrote:
    > Solving that problem calls for a different approach, because when the
    > exact
    > time is as yet unknown, neither are the exact positions of the bodies in
    > the
    > sky. That's why additional observations of the altitudes of the bodies
    > were
    > called for; or another technique, that of iteration, might be possible.
    Two altitudes were needed, but there was no need for them to be of the
    bodies used for the lunar distance. The practice of land navigators in the
    18th and 19th centuries seems to have been to take an altitude of a body
    that was either rising or setting for local time and a meridian altitude
    for latitude. Even when the lunar was a sun-moon measurement (so that the
    time sight used a sun altitude), the lunar was cleared with a calculated
    altitude for the sun (i.e. no effort was made to extrapolate the measured
    sun altitude to make it coincident with the measured lunar distance).
    Ken Muldrew.
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