NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Nocturnal used to find time if HW.
From: John Huth
Date: 2011 Dec 27, 09:54 -0500
From: John Huth
Date: 2011 Dec 27, 09:54 -0500
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.
--
Keeping up with the grind
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.
----------------------------------------------------------------
NavList message boards and member settings: www.fer3.com/NavList
Members may optionally receive posts by email.
To cancel email delivery, send a message to NoMail[at]fer3.com
----------------------------------------------------------------
Keeping up with the grind