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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Astra IIIb: First Impressions
From: Bill B
Date: 2014 Mar 13, 16:17 -0400
From: Bill B
Date: 2014 Mar 13, 16:17 -0400
On 3/13/2014 3:31 PM, Randall Morrow wrote: > ean, I suggest you opt to do sun index correction check as outlined in > the article by Starpath. (& others) I would add that when checking the the observed SD (on + off) against actual SD you use Frank's sight for SD. Rounding to a single decimal place in the NA can throw you off even if you are dead-nuts on, especially if you compare your on-and-off the arc limb-to-limb totals to 4SD. Example: On + Off = 32.3 + 31.9 = 62.4 IE = (32.3 - 31.9)/2 = 0.2 Frank's SD =16.05 4X Franks = 64.2 NA SA = 16.1 4X NA SD = 64.4 Frank's Almanac http://reednavigation.com/lunars/nadata_v5.html
