NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Andrés Ruiz
Date: 2008 Jun 2, 10:58 +0200
Less than one minute with the “Polynomial LS” software: Copy the t/Hs to a file. Open it and push the [Fit] bottom.
Usually, when I go sailing, I go alone, or I am the only who know to do it. I don’t have time to leave the cockpit, so I take sights and use my software to do the calculations quickly.
Andrés
De:
NavList@fer3.com [mailto:NavList@fer3.com] En nombre de Anabasis75@aol.com
Enviado el: lunes, 02 de junio de
2008 10:41
Para: NavList@fer3.com
Asunto: [NavList 5245] Re:
Exercise #5 Lat/Long near Noon.
Wow Andres,
Way too much Calculus for me to handle out here at sea. I have been removed from this math for more then a decade. Interesting to see the errors in each sight from the graphs however. Good to determine my personal error in sights. I see you have me off of LAN by 5 seconds if I am reading this correctly. I will have to recompute Hs to Ho for your time to determine Lat error when I am next on the bridge. I will post those results (unless anyone beats me to it).
I am definitely going to repeat this experiment in the Fall when I return out here to see how the results change when the sun is in the Southern declinations and closer to the Equinox. I hope that you run the data and see how we do. I just hope I can give you a good set of data.
Jeremy
In a message dated 6/2/2008 6:25:52 P.M. West Pacific Standard Time, aruiz@orona.es writes:
Jeremy,
I have attached the Hs and time of LAN using Least squares fitting:
The curve equation is: Hs = a0+a1*t+a2*t2
The maximum gives:
t LAN = -a1/(2a2)
Hs LAN = a0-a2t2
Andrés
<BR
--~--~---------~--~----~------------~-------~--~----~
Navigation List archive: www.fer3.com/arc
To post, email NavList@fer3.com
To , email NavList-@fer3.com
-~----------~----~----~----~------~----~------~--~---