NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: slide rule sight reduction accuracy
From: Gary LaPook
Date: 2009 Aug 14, 02:47 +0200
From: Gary LaPook
Date: 2009 Aug 14, 02:47 +0200
Very nice! I don't have a copy of Geoffrey's long term almanac but since he developed it I am sure it is a good one. I will have to contact him to see how I can get a copy. I noticed that you added a rule for when Y < 54', a case I didn't think about on my form. I did notice one error, however. "If 1> H > 90 assume another lon" should be "If 1 > H > 89." Thank for the improved form. gl Hein Bodahl wrote: > On 19.06.2009 12:50, Gary LaPook wrote: > >> Here is the form I had meant to send. This uses my notation of "W" >> instead of Bygrave's "y" on the previous form. >> >> gl >> > > If it could be of use. > I have attached a compiled workform based on the one from Geoffrey > Kolbe's "Long Term Almanac" to calculate declination and LHA, and yours > to work out the Hc and Zn from the flat Bygrave. > > I got it to fit on one page with some space to scribble. I have > laminated it and use a whiteboard pen to fill it in. Using matte > lamination you could probably use a soft pencil. > > The colors match the colors I have added to the headers from the tables > I have scanned from the "Long Term Almanac" (not attached, get it > yourselves :-) ). The whole set including the Bygrave fit on 9 sheets. > > (I have made sure it is ok with mr. Kolbe to post the workform as it is > partly copied from the "Long Term Almanac".) > > > Hein > > > > --~--~---------~--~----~------------~-------~--~----~ NavList message boards: www.fer3.com/arc Or post by email to: NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---