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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Reality check
From: Jean-Philippe Planas
Date: 2006 Jun 6, 09:52 -0700
JPP
From: Jean-Philippe Planas
Date: 2006 Jun 6, 09:52 -0700
Of course if you use the formulas, you can use any start point, one of which being your actual DR position. This start point induces non rounded values for LHA and Lat.
JPP
Guy Schwartz <guyschwartz@SBCGLOBAL.NET> wrote:
Guy Schwartz <guyschwartz@SBCGLOBAL.NET> wrote:
When using HO 249 The assumed latitude is rounded and the assumed Longitude is the number that will make the LHA an even number (within the range of +/- 30 min. of the DR Longitude). When plotting the assumed Lat and Long are used as the starting point of the procedure. OK if I use the formulas:Sin-1Hc = sin(dec) x sin(lat) + cos(dec) x cos(lat) x cos(LHA) and Cos-1 (Zn)= sin(dec) - sin(lat) x sin(Hc) / cos(Hc) x cos(lat) to calculate Hc and Z or Zn and then plot my positionwouldn't I be using the DR position as the start point?Thank you,Guy
JPP
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