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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Submarine celestial through periscope
From: Andrés Ruiz
Date: 2023 Mar 13, 09:49 +0100
From: Andrés Ruiz
Date: 2023 Mar 13, 09:49 +0100
Another example: 3 LoPsthat almost form an equilateral triangle.
Comparison table between the two examples:
|
|
Orion fix |
3 sights - Equilateral triangle |
|
EoC
|
Prob = 0.9500 k = 2.4477 theta = 6.5112 a = 0.0067 b = 0.0630 |
Prob = 0.9500 k = 2.4477 theta = -0.0120 a = 0.0058 b = 0.0063 |
|
DOP |
5.50 Moderate |
1.16 Excellent |
|
Z factor |
0.99 |
0.04 |
Intercept
method is based on Marcq Saint Hilaire line of position, is a linearization of
the general problem of celestial navigation, in the neighborhood of the
position.
The Circle of Equal Altitude is the intersection of a cone with the apex on the star and the Earth ( sphere or ellipsoid)
References:
Dilution of precision (navigation) - Wikipedia
Celestial Fix - n LoPs - by Least squares Sight Reduction algorithm. Paper & Excel https://sites.google.com/site/navigationalalgorithms/Home/papersnavigation
Fair winds!
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