NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Interpolation to latitude
From: Peter Fogg
Date: 2009 Nov 9, 17:57 +1100
--~--~---------~--~----~------------~-------~--~----~
NavList message boards: www.fer3.com/arc
Or post by email to: NavList@fer3.com
To , email NavList+@fer3.com
-~----------~----~----~----~------~----~------~--~---
From: Peter Fogg
Date: 2009 Nov 9, 17:57 +1100
Inuik
If you can post the problem in its entirety it may help.
On Mon, Nov 9, 2009 at 5:30 PM, <inuik@yahoo.com> wrote:
Greetings,
I recently got the book by L. Gray "100 Problems in Celestial Navigation". The very first problem, which had quite a lot of explanations "how to" for some reasons (?) didn't mention and didn't counted for interpolation for longitude in calculating nautical and civil twilight time. The interpolation for the latitude was done but not for the longitude. If I'm not mistaken (correct me please if I'm wrong) but the time of the phenomenon (twilight, f.e) is tabulated to the zone meridian. In the problem 1-1 DR longitude is 50 deg.W. The way I understand it the interpolation should be done for the closest zone meridian which in this case will be 45 deg.W. I looked in the Appendix but still didn't figure out why interpolaion for Longitude wasn't included. I made the interpolation and of course the results were different from what were in the book.
Quite possible the explanation for this can be very trivial:
1. I overlooked something in the text
2. I didn't understand something which quite obvious for everyone else
3. ??? "Oh, sorry, we forgot to include it" (which I doubt because the book is very well-known and definitely well-proved).
So, this is my question: am I mistaken regarding this ?
Thanks
--~--~---------~--~----~------------~-------~--~----~
NavList message boards: www.fer3.com/arc
Or post by email to: NavList@fer3.com
To , email NavList+@fer3.com
-~----------~----~----~----~------~----~------~--~---