NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Latitude and longitude around noon
From: Bill Ritchie
Date: 2017 Mar 30, 23:05 +0100
From: Bill Ritchie
Date: 2017 Mar 30, 23:05 +0100
Thank you for setting this up, Frank. I have learned so much from the dialogue. I'm sure others will feel the same.
One surprise to me was that all the submitted longitudes were West of your position, as first attachment shows. (Names removed to protect the innocent!)
Analysing the sights, (second attachment) the average agreement with the theoretical altitudes (according to Astron) is a highly commendable 0.11'. However, the average of the first five is +0.3', whilst the second five is -0.1'. Perhaps this bias in the distribution caused both the math experts and graph plotters alike to deduce a more Westerly longitude.
On the subject of cheating, Brad, you could have used the 24 feet height of eye information to advantage with Google Earth and also the track of that vessel (Christian Reinauer) that was shown on Marinetraffic.com for a few days afterwards.
Thanks again, Frank.
One surprise to me was that all the submitted longitudes were West of your position, as first attachment shows. (Names removed to protect the innocent!)
Analysing the sights, (second attachment) the average agreement with the theoretical altitudes (according to Astron) is a highly commendable 0.11'. However, the average of the first five is +0.3', whilst the second five is -0.1'. Perhaps this bias in the distribution caused both the math experts and graph plotters alike to deduce a more Westerly longitude.
On the subject of cheating, Brad, you could have used the 24 feet height of eye information to advantage with Google Earth and also the track of that vessel (Christian Reinauer) that was shown on Marinetraffic.com for a few days afterwards.
Thanks again, Frank.
Bill Ritchie
