NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Gary LaPook
Date: 2014 Aug 27, 12:58 -0700
You missed one step, step 2.5 (between step 2 and 3) should be divide by 2. Greg suggestion was to first apply twice the semidiameter first but I think that confuses it. Follow my suggestion allow you to use the normal sun correction table. Gary LaPook |
From: Samuel L <NoReply_SamuelL@fer3.com>;
To: <garylapook@pacbell.net>;
Subject: [NavList] Re: Noonsite using artificial horizon? Did I do it correctly?
Sent: Wed, Aug 27, 2014 3:51:01 PM
Greg, I'm getting a little better at taking a noon sight. I've read at length the replies concerning using an AH and using an Upper Limb or Lower Limb observation....but am still confused. Now I take the Lower Limb of the Sun and put it tangent to the Upper Limb of the reflected Sun from my AH. What correction do I apply in that case? I found this- http://astro.ukho.gov.uk/data/na2003/bookmark03.pdf ...which mentions UL and LL in the Apparent Altitude columns. Do I use that? Or....per the serveral other posts about this topic, do I simply subtract Refraction and continue onwards with the other calculations like this? Here are the steps I use 1- Measured Altitude at LAN 2- +/- Index Error 3- Result= Hs 4- Subtract Refraction 5- Result= Ho 6- Subtract Ho from 90 D 7- The result is Zenith Distance 8- Add Declination (assuming it's "Same name") 9- Result= Latitude at LAN
Thanks again,
Sam |
