NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Federico Rossi
Date: 2009 Jan 6, 21:20 +0100
Lu,
If I’ve understood well, this error doesn’t depend on your
latitude on earth, i.e. it’s a maximum of 1 nm for every 4 seconds (for bodies
due east or west) whether you are on the equator or far from it, does it?
Federico
Da:
NavList@fer3.com [mailto:NavList@fer3.com] Per conto di Lu
Abel
Inviato: martedì 6 gennaio 2009 20.05
A: NavList@fer3.com
Oggetto: [NavList 6941] Re: Chronometer Suggestions
Irv and Bill:
It's a MAXIMUM of 1 NM for every 4 seconds, not a minimum.
If the body you're sighting is directly north or south of you, even a fairly
significant time error would result in a very minimal shift in the LOP produced
by the body (the extreme example is Polaris). On the other hand, if
the body you're sighting is directly east or west, then it's Geographic
Position is moving by 1 NM every four seconds and any LOP developed from that
sight would be off by 1 NM for every four seconds of clock error.
Lu Abel
Irv Haworth wrote:
Minimum of 1 NM for every 4 seconds..( a quick answer)..
Irvin F Haworth
W, Van BC Canada
From: NavList@fer3.com [mailto:NavList@fer3.com] On
Behalf Of William Sellar
Sent: January 6, 2009 5:05 AM
To: NavList@fer3.com
Subject: [NavList 6931] Re: Chronometer Suggestions
As a beginning celestial navigator, I am wondering how much
time and watch accuracy is actually required for practical navigation.
Can we predict how many miles off one would be for every second of time error?
Bill
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