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    Re: Nocturnal used to find time if HW.
    From: Hewitt Schlereth
    Date: 2011 Dec 27, 14:16 -0800
    My 1939 Bowdich has a table of luni-tidal intervals for many ports around the world. I found it worked real well for the US East Coast, and included it in my coastal nav book.  Hewitt 

    Sent from my iPad

    On Dec 27, 2011, at 6:54 AM, Apache Runner <apacherunner@gmail.com> wrote:

    The was a pretty common way of finding tides.   Almanacs would describe the lag or advance between MP of the moon and the tide.   In some cases, ports would be clustered by the location of the moon (NW, SW, SE, E etc) when high tide occurred, and then the timing was given in terms of days after the new moon. 

    Some students in my class constructed replicas of nocturnals and tested them out.   

    On Tue, Dec 27, 2011 at 6:18 AM, Keith Lindsay <kw.r.lindsay@gmail.com> wrote:

    This nocturnal was made by Hunfry Cole of London in about 1575. To find the time of HW you also have to know the 'Establishment of the Port'. References in this paper have a table of lunitidal intervals.

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