# NavList:

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

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Re: Noon sight for longitude
From: Andrés Ruiz
Date: 2008 Jul 14, 08:20 +0200

The derivation of the equations in "POSITION FROM OBSERVATION OF A SINGLE BODY
James N. Wilson Vol. 32, No. 1, 1985" is totally general, and under the
conditions George says, they must work.

For the simulation in [NavList 5794], I have used the simplified formula:
Sn = V * DCOS(R)
d = dDecdt
TimeOfLANcorrection = 48# / PI * (Sn - d) * (DTAN(B) - DTAN(Dec))

But for this simulation I have used the general one, because a component of
the course in the N-S and E-W axis appears:
V = V / 60#
Sns = V * DCOS(R)
Sew = V * DSIN(R)

dBdt = Sns
dLdt = Sew / DCOS(B)

TimeOfLANcorrection2 = 3600# * 180# / PI * (dBdt - dDecdt) * (DTAN(B) - DTAN(Dec)) / (dLHAdt * dLHAdt)

The solution is t LAN: 15:36:51 from data and form James equation!!!

Andrés

-----Mensaje original-----
De: NavList@fer3.com [mailto:NavList@fer3.com] En nombre de George Huxtable
Enviado el: viernes, 11 de julio de 2008 17:32
Para: NavList@fer3.com
Asunto: [NavList 5798] Re: Noon sight for longitude

Andres Ruiz wrote-
...
Andres' simulation would be interesting when applied to a latititude of say
53ºN, with a declination of -23º, when a low noon Sun makes things more
difficult..
...

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