NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: star fix, as good as it gets
From: Peter Hakel
Date: 2011 Jan 16, 17:27 -0800
From: "Anabasis75@aol.com" <Anabasis75@aol.com>
To: NavList@fer3.com
Sent: Sun, January 16, 2011 4:06:31 AM
Subject: [NavList] star fix, as good as it gets
From: Peter Hakel
Date: 2011 Jan 16, 17:27 -0800
1) From the upper transit of Gacrux: at UT=00:29:31
Lat: S 7d 14.8'
Lon: E 72d 21.9'
compare with DR:
Lat: S 7d 14.9'
Lon: E 72d 30.8'
2) From the NA many-body fix method, using all 6 bodies: at UT=00:30:00 (see attached image)
Lat: S 7d 14.7'
Lon: E 72d 30.8'
compare with DR:
Lat: S 7d 14.8'
Lon: E 72d 30.7'
Very nice!
Peter Hakel
Lat: S 7d 14.8'
Lon: E 72d 21.9'
compare with DR:
Lat: S 7d 14.9'
Lon: E 72d 30.8'
2) From the NA many-body fix method, using all 6 bodies: at UT=00:30:00 (see attached image)
Lat: S 7d 14.7'
Lon: E 72d 30.8'
compare with DR:
Lat: S 7d 14.8'
Lon: E 72d 30.7'
Very nice!
Peter Hakel
From: "Anabasis75@aol.com" <Anabasis75@aol.com>
To: NavList@fer3.com
Sent: Sun, January 16, 2011 4:06:31 AM
Subject: [NavList] star fix, as good as it gets
This is probably the best star fix I've ever shot as far as LOP
quality. Standard Deviation of intercept was 0.147 over 6
observations according to my reduction program. Fix error was about 0.1 nm
(about a ship length for me).
Here's the data if people want to play:
Date: 9 January 2011
Lat 7-14.8; S
Long 72-30.7' E @ 06h 30m
Crs 317 deg True
Spd 10.7 knots
Temp 80 deg F
Pressure 1007 MB
HoE 106 ft
IC -0.8'
ZD -6
Saturn
Hs 82d 46.8'
Time 06h 35m 55s
Venus
Hs 40d 19.6'
Time 06h 37m 08s
Arcturus
Hs 53d 08.4'
Time 06h 27m 37s
Dubhe
Hs 19d 20.4'
Time 06h 26m 24s
Hadar
Hs 34d 27.0'
Time 06h 32m 43s
Gacrux (this is a star at upper transit)
Hs 40d 16.4'
Time 06h 29m 31s