NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Azimuth Angle and the Time Diagrams
From: Henry Halboth
Date: 2015 Nov 28, 01:11 -0500
From: Henry Halboth
Date: 2015 Nov 28, 01:11 -0500
Steve,
A Time Diagram is drawn on the plane of the equinoctial (the parallel sphere), whereas the azimuth is measured on the plane of the horizon (the right sphere) - they cannot be both demonstrated on the same diagram, except by projection. I would suggest that you obtain, if possible, an old copy of Dutton's "Navigation & Nautica Astronomy", say the 5th edition or earlier, wherein you will find all this extensively dealt with.
Henry
On Fri, Nov 27, 2015 at 4:40 PM, Steve E. Bryant <NoReply_Bryant@fer3.com> wrote:
Dear Navlisters,
I like to use time diagrams to visualize the relationship between Longititude, LHA, GHA.
Why is it that the azimuth angle, Zn, for a celestial body, in this case the sun, is not descernable on the time diagram?
I'm speculating it might have something to do with measurements that can be represented wth two dimentional drawings and the three dimentional nature of the Zn; but, that is only a guess. I still can't conceptionalize any diffrence in the application.
I have encluded a drawing to help represent my question.
Thank you for your help.
Steve
Attached File:
(Time-diagram-Zn-.pdf: Open and save or View online)
