NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: S-table and long term almanacs
From: Stan K
Date: 2014 Oct 3, 16:02 -0400
From: Stan K
Date: 2014 Oct 3, 16:02 -0400
Carl,
Mike Pepperday's S-table was never in Bowditch and was only in the Nautical Almanac (Yachtsman's edition, now called the Commercial Edition) from 1991 through, I believe, 1993. Subsequently they came out in book form, still available from Celestaire for $9.95. A while back Mike provided me with the one and only copy of a single large folded sheet version of the S-table. I was going to look into having it reproduced, but it has been on the back burner for so long that it fell off the back of the stove. I suspect it will prohibitively expensive, but I will check at the next opportunity.
FWIW, a tool for cecking your S-table work (both Pepperday's original and Rodger Farley's Teacup Celestial modification) is included in Celestial Tools, along with several other sight reduction methods.
Stan
Mike Pepperday's S-table was never in Bowditch and was only in the Nautical Almanac (Yachtsman's edition, now called the Commercial Edition) from 1991 through, I believe, 1993. Subsequently they came out in book form, still available from Celestaire for $9.95. A while back Mike provided me with the one and only copy of a single large folded sheet version of the S-table. I was going to look into having it reproduced, but it has been on the back burner for so long that it fell off the back of the stove. I suspect it will prohibitively expensive, but I will check at the next opportunity.
FWIW, a tool for cecking your S-table work (both Pepperday's original and Rodger Farley's Teacup Celestial modification) is included in Celestial Tools, along with several other sight reduction methods.
Stan
-----Original Message-----
From: Carl Roberts <NoReply_Roberts@fer3.com>
To: slk1000 <slk1000@aol.com>
Sent: Fri, Oct 3, 2014 1:06 pm
Subject: [NavList] S-table and long term almanacs
From: Carl Roberts <NoReply_Roberts@fer3.com>
To: slk1000 <slk1000@aol.com>
Sent: Fri, Oct 3, 2014 1:06 pm
Subject: [NavList] S-table and long term almanacs
alright guys, the months are passing. Where are the S-tables? what years wewe they in bowdith, or NA?
maybe dr Kolb could boot the NA reduction and include Alan Bayless or S-Table. His Sun Almanac follows the Bowdith format. The HO 249/ "Seelf contained celestial navigation with HO 208" by John Letcher, Jr. have a slightly different method for long term almanac construction. They use a "correction" term to an almanac you have to get data from one you want. this uses any nonlinearity in your copy to compensate for that in the desired one. b=0: EQN(0)=20.3066 b=1: EQN(0)=20.548 b=2:EQN(0)=20.8001 b=3: EQN(0)=21.048 the correction is the difference between the year you want and the almanac. See HO249 pdf on Celestaire. I have LSREG out to 2100 using the data from the ipod NA
(yr-2000)/4= dividend "a" and a positive rem"b" EQN=EQN(0)-"a"x0.0306 (days)
