A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Antoine Couëtte
Date: 2020 Feb 15, 10:12 -0800
Thank you for your very interesting post.
I have independently verified all your published data and find them to be in full agreement with my own determinations.
It is therefore very interesting to observe that :
- When ones solves a Lunar Distance for Time from a known position - a "Lunar time sight" as you define it - then the parallatic retardation effects decrease the accuracy of the Time determination, exactly as anticipated.
While on the other hand :
- When one solves a Lunar Distance in the "classical way" - i.e. with the 2 additional heights, as there was no other way of proceeding for our forebears then - we seem to experiment that the parallactic retardation seems to have no appreciable effect onto the final UT determination accuracy.
At this quite strange, surprising and unexpected result, only one question to be [again] asked :
By which effect - ( unknown to me ) - do the classic methods of the lunars era seem to be able to overcome the parallactic retardation effect as regards the final UT determination accuracy?
Any crystal clear explanation from anybody ?
Best Regards to you Paul, and thanks again,
Antoine M. Couëtte