A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: David Pike
Date: 2019 May 4, 08:45 -0700
Geoffrey you wrote:
"........the true position is ....... one of the excentres, depending on which side of the lines of position the GP of the body is on."
Why should one of the excentres be so favoured...?
In real life it probably isn’t. It only hits you in the eye if you work out your hc and draw your azimuths from your actual true position, one of the angles between the three azimuths is greater than 180, and you have a constant error in ho. Then it’s just geometry, no navigation, probability, or having a bad day is considered. Life is not normally that kind. You might try it for three different assumed positions to allow the use of AP3270/HO249 and then stick in some funny times between observations. It might still all cancel out; I don’t know. That’s one for the mathematicians. DaveP