NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Nasr
From: Hewitt Schlereth
Date: 2009 Mar 23, 09:28 -0400
From: Hewitt Schlereth
Date: 2009 Mar 23, 09:28 -0400
Oops! Ageton is HO 211, not HO 214. -Hewitt On 3/23/09, Hewitt Schlerethwrote: > What the NA method does is break the Navigational Triangle into two > right spherical triangles. The first time you enter the table you put > in known factors (Lat and LHA) to get the unknowns in one right > triangle. Then use those now-knowns to solve for what you want (Hc and > Z) which are in the second. > > It helps a lot to have a sketch of the triangle to look at. This lets > you see what parts of the triangles the letters (A, B, F, etc.) refer > to. If you can, get a hold of Ageton (HO 214). The figure there is the > one you want. Ageton uses different labels than the NA does, but if > you read (patiently) paragraph 2 (Form of Tables) on page 284 of the > almanac, you can re-label the figure and see how it works. > > > Hewitt > > > On 3/23/09, Yanni Nikopoulos wrote: > > > > Hello George, I would love to have a copy of those pages. > > Thanks > > TURBO!!!!!cause bottles are for babies and superchargers blow!!! > > Which would you rather have, go fast goodies or shiny shoes? > > Your feet may look good, but if your engine blows up, you ain't going > > anywhere. > > > > Yanni Marinated > > S/V Princess Thalia > > Columbia 8.7 #73 > > On the Hard > > Mayo MD > > > > > > ________________________________ > > From: George Huxtable > > To: NavList@fer3.com > > Sent: Monday, March 23, 2009 5:39:28 AM > > Subject: [NavList 7728] Re: NASR > > > > > > Guy Schwartz asked- > > > > | I know how to reduce a sight using the Nautical Almanac Sight Reduction > > | method, however I don't > > | > > | Understand what I am doing aside from following the recipe. > > | > > | Can anyone give me a easy to understand description of what each step is > > | doing. > > > > =================== > > > > I think I have the answer to Guy's question. It's a paper in two parts, 7 A4 > > pages in all, which appeared in the spring and summer issues of "Navigator's > > Newsletter", by P M Janiszek, who, as I understand it, was responsible for > > these tables. I think, after reading those pages, Gay will feel that he > > knows all that needs to be known about those tables, and perhaps a bit more. > > > > I have sent scans of those pages backstage to Guy, but won't publish them to > > Navlist as they are copyright to the Newsletter. If anyone else would like > > to refer to a copy, I'm happy to share; just ask. > > > > George. > > > > > > > > > > > > > > > > > --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---