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Re: Lunars using Bennett
From: Geoffrey Kolbe
Date: 2008 Jul 04, 06:34 +0100
From: Geoffrey Kolbe
Date: 2008 Jul 04, 06:34 +0100
Ken Muldrew wrote: >Even when the sun was in range (as it always was in every case that I've >seen in the journals of David Thompson and Peter Fidler - literally >hundreds of sun-moon lunars) they would calculate the sun's altitude for >clearing the lunar despite having measured it within a few minutes (or >tens of minutes) of taking the lunar. There is a very nice web page written by J. Gottfred on the navigation methods David Thompson used. See http://www.northwestjournal.ca/dtnav.html#Art%20VII.%20Recomputing%20Thompsons%20Data�%20Greenwich%20Apparent%20Time%20by%20Lunar%20Distance.%20By%20J.%20Gottfred. Gottfred goes through an actual Thompson lunar distance observation in detail, reconstructing the methods that Thompson used. Geoffrey Kolbe --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---