NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Andrés Ruiz
Date: 2010 Nov 25, 08:54 +0100
Recently I have written the
“Time section” in Wikipedia, see Longitude by chronometer at http://en.wikipedia.org/wiki/Longitude_by_chronometer,
also you have a chart flow for the calculation.
For past methods, using
tables or other pre-formatted formulae, you can consult Chauvenet, or old
Bowditch, available for free at google books.
Regards
--
Andrés Ruiz
Navigational Algorithms
http://sites.google.com/site/navigationalalgorithms/
De:
navlist-bounce@fer3.com [mailto:navlist-bounce@fer3.com] En nombre de Doug MacPherson
Enviado el: jueves, 25 de
noviembre de 2010 8:12
Para: NavList@fer3.com
Asunto: [NavList] Using Polaris
and the Sunrise or Sunset to determine Lat/Long with the "time sight"
Chuck:
thanks for the great clarification. I like to play around with the time sight
method.
Recently
I have been getting latitude from polaris, and then using the exact time the
sun rises or sets (no sextant required)to get the altitude of the sun for the
"time sight" and subsequently the longitude. Although the sun is not
at the exact PVC crossing, it is (for my latitude of 38 degrees) close to
bearing due East or West.
I have a
copy of the 1938 Bowditch and use the time sight method described in Chapter
XII.
This
seems to provide latitude and longitude with a minimum of calculation and work.
Was this method ever used in the past?
Any
thoughts?
Doug
MacPherson
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