NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Art and Navigation
From: Carly Butler
Date: 2015 Apr 27, 07:33 -0600
From: Carly Butler
Date: 2015 Apr 27, 07:33 -0600
Date was the solstice: December 21st. And I was on the beach, not on a boat - sorry, forgot to mention both important pieces of information. I knew I should have an artificial horizon, but I actually thought it wasn't that important (!) and that I could get an approximate location that wouldn't be so far off. (I'm actually reading the thread about creating my own artificial horizon with a mirror in a bucket with great interest - that probably would have helped me a lot. At the time I thought 'oh well, I don't have any mercury but it will be fine…) Will have to look up what time it was exactly…something close to noon, Sisal time, but I will check… Thanks! Carly On 2015-04-27 00:06, Greg Rudzinski wrote: > Carly, > > I think we better just focus on your latitude by LAN (local apparent > noon) observation of the Sun from Sisal Mexico (Lat. 21° 10' N) for > now. If the Sun's declination was 23° 26' north (very close to summer > solstice) then the sextant Hs should have had a reading of 87° 35' at > LAN with an azimuth of 360° (due north). Your Hs at 41° 10' is too > far off to be a mistake even. If you were there during the winter > solstice then the declination would be 23° 26' south and the sextant > Hs would be 45° 16' with an azimuth of 180° (due south) and no > natural horizon to work with if you were at the beach. Were you on a > boat ? What was the date and UT (GMT) time of observation ? > > Greg Rudzinski > > FROM: Carly Butler > DATE: 2015 Apr 26, 23:47 +0100 > > Ok…here goes… > Took me longer than anticipated to dig this out of the mess that is > currently my studio. I have other sheets of calculations, but these > are the ones I wrote out for myself again to try and help me with the > next ones (clearly, not successfully!). > > I was actually in Sisal Mexico (not the middle of the Gulf of Mexico!) > > Phew, now a deep breath and to hit send... > > Thanks everyone! > > Carly > > ps - is anyone on this forum in or around Nova Scotia? I would love to > find some in person help or a class around here... > > [1] > > Links: > ------ > [1] > http://fer3.com/arc/m2.aspx/Art-Navigation-Rudzinski-apr-2015-g31144
