Next message: Michael Dorl: "Re: Beginner Meridian Passage Question"
You can see at
http://www.geocities.com/andresruizgonzalez/celestial/polaris_eng.html
A graphic of Polaris SHA and Declination during this year and 2005
-----Mensaje original-----
De: Navigation Mailing List [mailto:]
En nombre de Noyce, Bill
Enviado el: viernes, 03 de septiembre de 2004 15:13
Para:
Asunto: Re: [NAV-L] Beginner Meridian Passage Question
> > b) when you think Polaris is directly below or above the pole, add
or
> > subtract its difference (which you have memorized as about 45');
>
> It looks to me that the average declination for Polaris in 2004 was
close to 89 d 17'. 90 - > 89 d 17' = 43'. Am I missing some 2nd and
3rd order variables when calculating the distance > of Polaris from PN?
Id so, what?
For lifeboat navigation, I was assuming (1) a couple of minutes / miles
doesn't matter;
(2) a round number was easier to remember; and (3) I had the impression
Polaris had already passed as close to the pole as it was going to, and
was now slowly moving away. I now believe #3 is wrong -- it looks to me
as if that happens around 2008, though the motion is less than 0.1'
every few years.
So if you can remember 44' or 43', use that.
-- Bill
