NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Using an artificial horizon
From: Mike Burkes
Date: 2010 Sep 2, 16:58 -0700
From: Mike Burkes
Date: 2010 Sep 2, 16:58 -0700
Hello Andrew, great job pretty cool heh? Yes as per past discussions on this thread limb to limb will yield greater accuracy. I too have tried several obs and they have yielded good results. Also try taking several shots well before and/or after LAN, graphing against time, finding line of best fit,and solving the ones that are closest to best fit. Keep on shootin' and reducin'!
Mike Burkes
m_burkes@msn.com
626-833-1521
Date: Thu, 2 Sep 2010 16:09:45 -0700
From: amc21769@yahoo.com
Subject: [NavList] Re: Using an artificial horizon
To: NavList@fer3.com
From: Bill Morris <engineer@clear.net.nz>
To: NavList@fer3.com
Sent: Thu, September 2, 2010 4:24:00 PM
Subject: [NavList] Re: Using an artificial horizon
glapook wrote:
"Lining up the bottom edge of the
sun's image in the index mirror with the top edge of its inverted image
in the liquid gives you a lower limb observation."
This is something other advisors seem to have missed. Always line up the edges(limbs) of the sun's images. Trying to superimpose one on top of the other is more difficult and less accurate, though if you did get it right, you would not then have to apply a correction for semi-diameter.
I began practice 30 years ago using the reflection off the surface of a swimming pool on a calm day. It worked at night too with stars, and made identification of images easier, given the wide "field of view". I graduated to old sump oil in a roasting tin.
Bill Morris
Pukenui
New Zealand
----------------------------------------------------------------
NavList message boards and member settings: www.fer3.com/NavList
Members may optionally receive posts by email.
To cancel email delivery, send a message to NoMail[at]fer3.com
----------------------------------------------------------------
Mike Burkes
m_burkes@msn.com
626-833-1521
Date: Thu, 2 Sep 2010 16:09:45 -0700
From: amc21769@yahoo.com
Subject: [NavList] Re: Using an artificial horizon
To: NavList@fer3.com
All,
I want to thank everyone for the advice and support. I took my little artificial horizon our this evening and got everything lined up. Took a sun sight but overlaid the images of the two suns (did not know to have the limbs touch). I did go online to Celnav.de and used Henning's sight reduction program and was within 22 miles of my house lat and long which I measure using a GPS. I WAS THRILLED!!!! Now that I know how to do this I will probably practicing on a regular basis.
Again thanks to everyone for your help and guidance.
Andrew
From: Bill Morris <engineer@clear.net.nz>
To: NavList@fer3.com
Sent: Thu, September 2, 2010 4:24:00 PM
Subject: [NavList] Re: Using an artificial horizon
glapook wrote:
"Lining up the bottom edge of the
sun's image in the index mirror with the top edge of its inverted image
in the liquid gives you a lower limb observation."
This is something other advisors seem to have missed. Always line up the edges(limbs) of the sun's images. Trying to superimpose one on top of the other is more difficult and less accurate, though if you did get it right, you would not then have to apply a correction for semi-diameter.
I began practice 30 years ago using the reflection off the surface of a swimming pool on a calm day. It worked at night too with stars, and made identification of images easier, given the wide "field of view". I graduated to old sump oil in a roasting tin.
Bill Morris
Pukenui
New Zealand
----------------------------------------------------------------
NavList message boards and member settings: www.fer3.com/NavList
Members may optionally receive posts by email.
To cancel email delivery, send a message to NoMail[at]fer3.com
----------------------------------------------------------------