NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Polaris
From: Peter Hakel
Date: 2009 Jun 26, 15:10 -0700
From: "frankreed@HistoricalAtlas.com" <frankreed@HistoricalAtlas.com>
To: NavList@fer3.com
Sent: Wednesday, June 24, 2009 7:08:37 PM
Subject: [NavList 8785] Re: Polaris
[...]
So... build yourself a spreadsheet. Get the SHA and Dec of Polaris from the almanac for some recent year. Then fiddle with k0,k1,k2, and maybe k' until the spreadsheet matches the Polaris tables. I think that's everything, but no guarantees! :-)
-FER
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From: Peter Hakel
Date: 2009 Jun 26, 15:10 -0700
Thank you, Frank, for this detailed explanation. A spreadsheet is attached. Getting the computed SHA of Polaris to agree with published almanacs is a challenge (I get within 2.0'). The good news is that this does not seem to degrade the accuracy of what is really of interest here, i.e. the latitude (and azimuth of Polaris).
Peter Hakel
Peter Hakel
From: "frankreed@HistoricalAtlas.com" <frankreed@HistoricalAtlas.com>
To: NavList@fer3.com
Sent: Wednesday, June 24, 2009 7:08:37 PM
Subject: [NavList 8785] Re: Polaris
[...]
So... build yourself a spreadsheet. Get the SHA and Dec of Polaris from the almanac for some recent year. Then fiddle with k0,k1,k2, and maybe k' until the spreadsheet matches the Polaris tables. I think that's everything, but no guarantees! :-)
-FER
--~--~---------~--~----~------------~-------~--~----~
Navigation List archive: www.fer3.com/arc
To post, email NavList@fer3.com
To , email NavList-@fer3.com
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File: 108825.polaris.xls
