# NavList:

## A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

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Re: Azimuth Angle and the Time Diagrams
From: Steve E. Bryant
Date: 2015 Nov 28, 01:42 -0600

Henry,

I have the tenth edition of that reference.  Chapter XI titled “Computed Altitude and Azimuth” appears to be a remnant of the earlier work you suggested and doesn’t look like it will be of much use (to me) in clearing up my original question.  The explanation must be a bit complicated I can see.

Thank you,

Steve

From: NavList@fer3.com [mailto:NavList@fer3.com] On Behalf Of Henry Halboth
Sent: Saturday, November 28, 2015 12:56 AM
To: steveebryant---.net
Subject: [NavList] Re: Azimuth Angle and the Time Diagrams

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.

Steve

Attached File:

(Time-diagram-Zn-.pdf: Open and save or View online)

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