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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: : David Thompson's Navigational Technique
From: George Huxtable
Date: 2004 Jun 1, 13:27 +0100
From: George Huxtable
Date: 2004 Jun 1, 13:27 +0100
Ken Muldrew wrote, about observations in October 1800- The longitude by >account gives a time of about 7 hours 39 minutes so Greenwich time >would be about 4:26 on the 12th. The online Nautical Almanac gives a >sun declination of 7? 29' S for this time and date, exactly in accord >with what Thompson writes. ============== Could Ken please be a bit more specific about what he looked up in the online Nautical Almanac for 1800, which presumably works in terms of the modern civil definition of GMT? Did he actually enter a value for GMT into that online almanac of 04h 26m on 12 Oct 1800, and did that give him a Sun declination of 7deg 29'S? It's just that Mike Burkes and I are presently trying to chase up some discrepancies between predictions of declination from different sources. George. ================================================================ contact George Huxtable by email at george@huxtable.u-net.com, by phone at 01865 820222 (from outside UK, +44 1865 820222), or by mail at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK. ================================================================
