NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: In Honor Of Jeremy Two Stars Full Lan's : One Upper And One Lower Culmination
From: Peter Hakel
Date: 2009 Sep 21, 17:46 -0700
Peter Hakel
From: "antoine.m.couette@club-internet.fr" <antoine.m.couette@club-internet.fr>
To: NavList@fer3.com
Sent: Sunday, September 20, 2009 11:27:20 PM
Subject: [NavList 9833] Re: IN HONOR OF JEREMY TWO STARS FULL LAN's : ONE UPPER and ONE LOWER CULMINATION
And by the way, what method did you use to work both LAN's ? If you rework both examples from your published results as DR positions and go with the Azimut/Intercept method (i.e. the so-called Marc Saint Hilaire), do you still get the very same final fixes ?
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From: Peter Hakel
Date: 2009 Sep 21, 17:46 -0700
My version of the "rapid-fire fix" method applied to your Deneb example gives me:
N 42 deg 08.0' +/- 1.7'
E 6 deg 58.3' +/- 9.2'
This is not as good as the transit algorithm. My intermediate results (input file for the rapid-fire fix program) are:
Time of fix (UT hours, minutes, seconds):
16 30 0
Assumed position:
Latitude (degrees, minutes)
42 8.4
Longitude (degrees, minutes)
6 53.7
Course (degrees, true)
40.2
Speed (knots):
22.5
Number of observations:
6
UT Ho Intercept Azimuth
h m s d m nm (T=+) d (true)
16 26 06 86 41.1 +1.3 20.3
16 28 02 86 58.0 -0.6 14.5
16 30 12 87 03.3 +0.1 7.7
16 32 31 87 05.7 +0.7 0.1
16 35 18 87 04.0 +1.4 351.0
16 38 43 86 55.1 +1.9 340.5
N 42 deg 08.0' +/- 1.7'
E 6 deg 58.3' +/- 9.2'
This is not as good as the transit algorithm. My intermediate results (input file for the rapid-fire fix program) are:
Time of fix (UT hours, minutes, seconds):
16 30 0
Assumed position:
Latitude (degrees, minutes)
42 8.4
Longitude (degrees, minutes)
6 53.7
Course (degrees, true)
40.2
Speed (knots):
22.5
Number of observations:
6
UT Ho Intercept Azimuth
h m s d m nm (T=+) d (true)
16 26 06 86 41.1 +1.3 20.3
16 28 02 86 58.0 -0.6 14.5
16 30 12 87 03.3 +0.1 7.7
16 32 31 87 05.7 +0.7 0.1
16 35 18 87 04.0 +1.4 351.0
16 38 43 86 55.1 +1.9 340.5
Peter Hakel
From: "antoine.m.couette@club-internet.fr" <antoine.m.couette@club-internet.fr>
To: NavList@fer3.com
Sent: Sunday, September 20, 2009 11:27:20 PM
Subject: [NavList 9833] Re: IN HONOR OF JEREMY TWO STARS FULL LAN's : ONE UPPER and ONE LOWER CULMINATION
And by the way, what method did you use to work both LAN's ? If you rework both examples from your published results as DR positions and go with the Azimut/Intercept method (i.e. the so-called Marc Saint Hilaire), do you still get the very same final fixes ?
--~--~---------~--~----~------------~-------~--~----~
NavList message boards: www.fer3.com/arc
Or post by email to: NavList@fer3.com
To , email NavList-@fer3.com
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