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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Andrés Ruiz
Date: 2010 Dec 15, 12:02 +0100
I want to thank to Antoine for giving me the pleasant
opportunity to study this atypical case.
The azimuth line of position is defined by the angle
j and the distance e in the same way as in a Marcq LoP. The parameters of this
line are calculated as follow:
DroiteAzimuth( Zo, Zc, h, B,
*e, *J )
{
a =
sqrt(SQ(TAN(h)*SIN(Z))+SQ(TAN(B)-TAN(h)*COS(Z)));
*e = (Zo-Zc)/a;
*J = ACOS( TAN(h)*SIN(Z)/a
);
}
A fix by a ZLop and a MSH LoP :
An example (see LoPZ.png ).
The azimuth has an error of -2º.
The altitude LoP is:
15/12/2010
11:13:02 UT1
Be = 43.316666 º
= 43º 19.0'
Le = -2.000000 º
= -2º 0.0'
ALMANAQUE NAUTICO
- NAUTICAL ALMANAC
Sun
GHA = 349.488640 º
= 349º 29.3'
Dec = -23.271530 º
= -23º 16.3'
SD = 16.249596 '
HP = 0.148910 '
CORRECCION DE LA
ALTURA - ALTITUDE CORRECTION
Limb: lower
Ref: Sea Horizon
Hs = 22.1000 º =
22º 6.0'
ie = 0.0000 '
heas =
T =
P = 1010.0000 hPa
Hoi = 22.1000 º
dip = 0.0464 º
Ha = 22.0536 º =
22º 3.2'
R = 0.0400 º
OB = -0.00000668 º
HP = 0.0025 º
PA = 0.00229358 º
SD = 0.2708 º
Aug = 0.00000440 º
SDag = 16.249860 '
Ho = 22.2868 =
22º 17.2'
DETERMINANTE DE LA
RECTA DE ALTURA -
LHA = 347.488640 º
= 347º 29.3'
Hc = 22.4245 º =
22º 25.5'
Z = 167.6 º
p = Ho-Hc =
-0.137706 º = -8.262343 '
and the azimuth line is.
a = 1.133497
e = -1.764452
J = 87.884208
Regards
--
Andrés Ruiz
Navigational Algorithms
http://sites.google.com/site/navigationalalgorithms/