NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Aquino's Method
From: Dave Walden
Date: 2009 Jun 23, 08:27 -0700
From: Dave Walden
Date: 2009 Jun 23, 08:27 -0700
Aquino's was among the early "short" or "inspection" tabular methods. His method is described in an article he wrote for the U S Naval Institute Proceedings, "Altitude and Azimuth Tables for Facilitating the Determination of Lines of Position and Geographical Position at Sea", Oct 1908, Vol 34, pg 1299-1312: http://www.archive.org/details/proceedingsofuni34unituoft He divides the triangle, avoiding log-natural and addition issues. Both assumed latitude and longitude are carefully chosen so that Hc and Z are used directly from adjacent columns in his table. (Also of interest in the above volume is another Aquino article, "Nomograms for Deducing Altitude and Azimuth", pg 633) His tables, "The 'Newest' Navigation Altitude and Azimuth Tables for Facilitating the Determination of lines of Position and Geographical Position at Sea", 1918, Potter (London), are available on line as: http://openlibrary.org/b/OL7145279M/newest-navigation-altitude-and-azimuth-tables-for-facilitating-the-determination-of-lines-of-position-at-sea His tables from the above were added to HO 171, "Altitude, Azimuth, and Line of Position", making it HO 200 (see attached). Available on line as: http://openlibrary.org/b/OL17939097M/Altitude,-azimuth,-and-line-of-position This seems to have been the first publication by HO of a "short" or "inspection" tabular method. The attached spreadsheet generates his table and implements his "first" method from HO 200. I find that being "forced" to tell the computer explicitly how to implement a method significantly increases my understanding. No guarantee on the spreadsheet, but it seems to be working. (Been using a new plotter, "Le vrai rapporteur BRETON". Seems nice.) --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---