NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: USCG Student Sample Problem #3 for East Longitude
From: Peter Hakel
Date: 2013 Apr 21, 18:01 -0700
From: Peter Hakel
Date: 2013 Apr 21, 18:01 -0700
Hello Yves,
My result for Sun / Moon:
Lat: S 25d 26.1'
Lon: E 176d 51.1'
agrees with everyone.
My result for Acrux / Diphda / Jupiter:
Lat: S 25d 08.4'
Lon: E 178d 44.6'
agrees with Antoine's.
I believe that your result in this case is a little different due to the value of Acrux declination, which should be: S 63d 10.5'.
Cheers,
Peter Hakel
From: Yves Robin-Jouan <yrobinjo@noos.fr>
To: pmh099@yahoo.com
Sent: Sunday, April 21, 2013 11:59 AM
Subject: [NavList] Re: USCG Student Sample Problem #3 for East Longitude
My result for Sun / Moon:
Lat: S 25d 26.1'
Lon: E 176d 51.1'
agrees with everyone.
My result for Acrux / Diphda / Jupiter:
Lat: S 25d 08.4'
Lon: E 178d 44.6'
agrees with Antoine's.
I believe that your result in this case is a little different due to the value of Acrux declination, which should be: S 63d 10.5'.
Cheers,
Peter Hakel
From: Yves Robin-Jouan <yrobinjo@noos.fr>
To: pmh099@yahoo.com
Sent: Sunday, April 21, 2013 11:59 AM
Subject: [NavList] Re: USCG Student Sample Problem #3 for East Longitude
Hello Greg,
Using ASTROLAB with your data (plus ACRUX Dec = 63° 5.94'S), I got the following results :
DIPHDA + ACRUX + JUPITER : 25° 10.2'S 178° 40.9'E, radius = 0.15 NM
MOON + SUN (5 hours later): 25° 26.1'S 176° 51'E
5 sights with transport : 25° 28.5'S 176° 54.6'E, radius = 2.2 NM (!)
MOON + SUN (5 hours later): 25° 26.1'S 176° 51'E
5 sights with transport : 25° 28.5'S 176° 54.6'E, radius = 2.2 NM (!)
The last line integrates a shift of near 94 NM between Jupiter and Moon sights !
DOP is 1.9 for the 3 first sights, and is reduced to 1.4 for 5 sights.
DOP is 1.9 for the 3 first sights, and is reduced to 1.4 for 5 sights.
Regards,
Yves Robin-Jouan
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