NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Villarceau - Nouvelle navigation astronomique
From: Andrés Ruiz
Date: 2017 Jul 3, 08:37 +0200
12148/bpt6k9699570x/f13.image
see: https://navlist.net/m2.aspx/LOPs-without-DR-socalled-Douwess-problem-Robin-Jouan-feb-2015-g30448
There is a paper in the JoN:
https://www.cambridge.org/core/journals/journal-of-navigation/article/radio-position-lines-and-the-intercept-method/91A9FC2D2DBADD09E7CEA9B9819AFD78
In 1877 a two-volume book, Nouvelle Navigation Astronomique, edited by the astronomer Villarceau and a naval officer, Magnac, was published in Paris. The book, which may be considered the most comprehensive work on astronomical position lines up to date, covers completely the theoretical treatment of circles of equal altitude on Mercator projections and their practical evaluation, and considers the effects of possible mistakes and errors. In the present writer's view these factors have not yet been sufficiently appreciated. It is surprising that similarly detailed descriptions of the other position lines used for navigation have not yet been published; although, apparently, the attitude towards these questions has altered since that time. The change in methods of navigation, particularly with the introduction of radio aids, has brought a variety of other position lines to the fore, and the predominance of Mercator's projection is not as universal as it was eighty years ago. In order that these premises may be clarified, a summary of the various position lines in use today is here given.
From: Andrés Ruiz
Date: 2017 Jul 3, 08:37 +0200
Dear Yves,
indeed it is...
For those interested, the book is available at:
http://gallica.bnf.fr/ark:/see: https://navlist.net/m2.aspx/LOPs-without-DR-socalled-Douwess-problem-Robin-Jouan-feb-2015-g30448
There is a paper in the JoN:
https://www.cambridge.org/
In 1877 a two-volume book, Nouvelle Navigation Astronomique, edited by the astronomer Villarceau and a naval officer, Magnac, was published in Paris. The book, which may be considered the most comprehensive work on astronomical position lines up to date, covers completely the theoretical treatment of circles of equal altitude on Mercator projections and their practical evaluation, and considers the effects of possible mistakes and errors. In the present writer's view these factors have not yet been sufficiently appreciated. It is surprising that similarly detailed descriptions of the other position lines used for navigation have not yet been published; although, apparently, the attitude towards these questions has altered since that time. The change in methods of navigation, particularly with the introduction of radio aids, has brought a variety of other position lines to the fore, and the predominance of Mercator's projection is not as universal as it was eighty years ago. In order that these premises may be clarified, a summary of the various position lines in use today is here given.
best regards,
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