# NavList:

## A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

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Re: Photo sextant sights
From: Andr�s Ruiz
Date: 2008 Jul 30, 15:37 +0200

```See also:
http://www.starpath.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=31;t=000040

Andr�s

________________________________________
De: NavList@fer3.com [mailto:NavList@fer3.com] En nombre de Wolfgang K�berer
Enviado el: mi�rcoles, 30 de julio de 2008 15:16
Para: NavList@fer3.com
Asunto: [NavList 5950] Photo sextant sights

Yesterday I received "The Navigator's Newsletter" issue 97 - 99. The last
issue contains an article by David Burch (from his book "Emergency
list not too long ago I read the article right away. It relates the example
of a "Photo sextant sight" taken in Florida at 27deg 12,2 min N, 80 deg 13,4
min W.

Now being in the legal profession I lack the knowledge or the brains (or both)
to invent new methods of celestial navigation, but like to try their
practical usefulness. The article sums up: "had we not known time or
longitude, we would have found our longitude this way to within 53 min ".
This would mean a possible error of about 47 miles - which is probably
acceptable.

Then I did a quick "Sumner": I varied the input to see what happens to the
result. On the assumption that there is no error in latitude (having bent my
sextant only after taking the height of Polaris or a star on the meridian)
and that my time is correct, I varied my assumed longitude and got a
perplexing result: Using Frank's program and assuming I am about 150 miles
out in the Atlantic (= assumed longitude 77deg 10 min W) I got the following
result:
"Error in Lunar: 0 min
Approximate Error in Longitude: 0 deg 00.4 min"
which - following David Burch - I interpret as saying I am almost at my
assumed position. As the "Photo Sextant Sight" supposedly was taken 3 degrees
further west something doesn't fit. What did I get wrong? It's not the input,
I checked it several times.

Dr. Wolfgang K�berer
Wolfsgangstr. 92
D-60322 Frankfurt am Main
Tel: + 49 69 95520851
Fax: + 49 69 558400

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