NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Francis Upchurch
Date: 2013 Dec 6, 02:53 -0800
Many thanks Frank.
Yes, I've successfully.used the Fuller slide rule to do lunars using Letcher's formulae,and the John Karl method.I'll try your "easy" series method soon. The Bygrave is already set up to do LOPs using the triangle just like the diagrams in John's book,which I understand, so that is why I chose that method first.(see attachments)I get good results when starting from RBA (azimuths difference?) but cannot work out how to get the unknown RBA, given known Hsd, hsd, dec etc. See attachments.With the Bygrave for LOPs you need LAH in the same way as I need now RBA.
I also attach a little paper on my slide rules which includes photos.
On other subjects. A few weeks ago you mentioned another short clearance method. Did you by chance get time to write that up? I know you are very busy!
Also ,re previous discussion on early lunars, I have found a paper by wales 1788 clearly describing lunars taken on the
dolphin, prior to Cook and almanacs and cleared by using 1767 Mariner's Guide. Will send if interested.
thanks again for all your help.
Francis
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