NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Graphical method by Favet / de 'Lisle
From: Lu Abel
Date: 2011 Apr 29, 07:47 -0700
From: Harri Ojanen <hojanen@kolumbus.fi>
To: NavList@fer3.com
Sent: Fri, April 29, 2011 2:29:16 AM
Subject: [NavList] Re: Graphical method by Favet / de 'Lisle
From: Lu Abel
Date: 2011 Apr 29, 07:47 -0700
Can anyone explain the nomongram shown? It's supposed be for calculating the azmuth of the star, but the axes are not labeled.
I mentioned I'm in the middle of teaching a celestial class. Sights are being reduced using a calculator and the Law of Cosines rather than tabularly. As I review my students' sight reductions, I've found no mistakes in Hc calculation, but several have made mistakes in azimuth calculation (more terms in the equation, possibility of negative cosines, ???). I'd love to be able to pass out copies of this nomogram as a way of helping them check for mistakes.
Lu
I mentioned I'm in the middle of teaching a celestial class. Sights are being reduced using a calculator and the Law of Cosines rather than tabularly. As I review my students' sight reductions, I've found no mistakes in Hc calculation, but several have made mistakes in azimuth calculation (more terms in the equation, possibility of negative cosines, ???). I'd love to be able to pass out copies of this nomogram as a way of helping them check for mistakes.
Lu
From: Harri Ojanen <hojanen@kolumbus.fi>
To: NavList@fer3.com
Sent: Fri, April 29, 2011 2:29:16 AM
Subject: [NavList] Re: Graphical method by Favet / de 'Lisle
Hi,
Regarding nomograms I came across this software:
http://www.pynomo.org/wiki/index.php?title=Example:Star_navigation
Looks like it's a general purpose code for producing nomograms, and the page behind the above links has an example for celestial navigation.
Cheers,
Harri
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