| my account | login-logout | resources | support | catalog | home | get webcard |

Online Classroom


Post New Topic  Post A Reply
search | help desk | commons
  next oldest topic   next newest topic
» Online Classroom   » Celestial Navigation   » Public Discussion of Cel Nav   » question on 120 degree spread between stars versus 60 degrees

   
Author Topic: question on 120 degree spread between stars versus 60 degrees
briangetty


 - posted February 26, 2022 06:41 AM      Profile for briangetty           Edit/Delete Post 
In Section 11.24 of the Celestial Navigation book, on page 174, you say that a 120 degree spread between the stars ensures that (with a fixed error) the correct position is in the center of the equilateral triangle, but that this is not true if the stars are 60 degrees apart. I am having great difficulty in understanding why that is; can you explain the difference?
David Burch


 - posted February 26, 2022 09:12 AM      Profile for David Burch           Edit/Delete Post 
A brief explanation can be seen in this article and in the textbook fig 11.24

https://www.starpath.com/resources2/Bearing_Fix_Accuracy.pdf

The most thorough answer to your question here is to download the free app we provide in this article and experiment with it

http://davidburchnavigation.blogspot.com/2016/07/most-likely-position-from-3-lops.html

see also this one that puts it into play:
https://davidburchnavigation.blogspot.com/2017/10/analysis-of-celestial-navigation-sight.html

From: Starpath, Seattle, WA


All times are Pacific  
Post New Topic  Post A Reply Close Topic    Move Topic    Delete Topic next oldest topic   next newest topic
Hop To:

Starpath School of Navigation

Copyright, 2003-2021, Starpath Corporation

Powered by Infopop Corporation
UBB.classicTM 6.3.1.1