# NavList:

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

Message:αβγ
Message:abc
 Add Images & Files Posting Code: Name: Email:
Re: Azimuth line of position
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 = 2.5000 m

T = 10.0000 ºC

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 - Marcq St Hilaire LoP

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

File:

File:

Browse Files

Drop Files

### Join NavList

 Name: (please, no nicknames or handles) Email:
 Do you want to receive all group messages by email? Yes No
You can also join by posting. Your first on-topic post automatically makes you a member.

### Posting Code

Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.
 Email:

### Email Settings

 Posting Code:

### Custom Index

 Subject: Author: Start date: (yyyymm dd) End date: (yyyymm dd)