NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Fw: Re: How Worsley Navigated
From: Frank Reed
Date: 2009 Feb 28, 10:11 -0800
From: Frank Reed
Date: 2009 Feb 28, 10:11 -0800
George H, you wrote: "All that's needed is, for May 7th (and for May 6th and 8th also) Sun declination and Equation of Time at Greenwich noon. Of course, such backwards predictions are available from modern sources, but it would be nice to see what the Almanac actually states." Any good modern source will differ only a few seconds of arc from printed almanac data for that era. As luck would have it, I have an American Nautical Almanac for 1916 within arm's reach. So here's the data for those dates from that almanac as well as the same from my online Nautical Almanac. From the AmNA(1916): GMT(old) Dec EqT May 6 00h 16�31.4' 3m27.8s May 6 12 16 39.7 3 30.0 May 7 00 16 48.1 3 32.2 May 7 12 16 56.3 3 34.1 May 8 00 17 04.5 3 36.0 May 8 12 17 12.6 3 37.6 From my online NA: GMT(new) Dec GHA Sun EqT(GHA Sun/15) May 6 12h 16�31.4' 0�51.9' 3m27.6s May 7 00 16 39.8 180 52.5 3 30.0 May 7 12 16 48.1 0 53.0 3 32.0 May 8 00 16 56.4 180 53.5 3 34.0 May 8 12 17 04.5 0 54.0 3 36.0 May 9 00 17 12.7 180 54.4 3 37.6 Enjoy. -FER PS: direct link to my online NA: http://www.historicalatlas.com/lunars/nadata_v5.html --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
