NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Using sun compass for calibrating boat compass
From: Bill B
Date: 2014 May 07, 20:11 -0400
From: Bill B
Date: 2014 May 07, 20:11 -0400
On 5/7/2014 7:21 PM, Sean C wrote: > In the previous post I mistyped the calculated azimuth as "88.2°". It > should've been 88.1°. Sorry I guess I can envision it in two ways. *My initial thought--Before meridian passage the object is moving diagonally from my vantage point, less vertical and more horizontal motion as it approaches meridian passage. Like the spoke of a wheel with one marker higher than another (N declination, N latitude) the outer marker would be north or east east of the inner marker (depending on time). Therefore its higher Ho apparent altitude vs Hc would shift its azimuth. *That being said, when I am facing a celestial object refraction can only move it vertically along its meridian towards zenith. Therefore it is in fact where I see it along the horizontal axis. What I question in your examples are as follows: If declination, LHA and latitude remain constant can your theoretical body have two Hc's? One of the 3 variables would have to change for that to happen, and it becomes a whole different scenario. Thanks for serving as a sounding board.
