NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: USCG Sample Problem #2 for Southern Hemisphere
From: Peter Hakel
Date: 2013 Apr 19, 17:24 -0700
From: Peter Hakel
Date: 2013 Apr 19, 17:24 -0700
Greg, Kermit,
I am getting 0.2' - 0.3' differences for Moon:
SD: 14.8'
Ho: 62d 26.3'
but agree with all the rest. My computed fix at UT = 20:00:00 (I used your numbers for input there, see attached PNG) is:
Lat: S 9d 41.1'
Lon: W 152d 43.9'
Good agreement overall, I think! :-)
Peter Hakel
From: Antoine Couëtte <antoine.m.couette@club-internet.fr>
To: pmh099@yahoo.com
Sent: Friday, April 19, 2013 7:03 AM
Subject: [NavList] Re: USCG Sample Problem #2 for Southern Hemisphere
You should be soon waking up ... therefore you need some reading ! :-)
I am getting 0.2' - 0.3' differences for Moon:
SD: 14.8'
Ho: 62d 26.3'
but agree with all the rest. My computed fix at UT = 20:00:00 (I used your numbers for input there, see attached PNG) is:
Lat: S 9d 41.1'
Lon: W 152d 43.9'
Good agreement overall, I think! :-)
Peter Hakel
From: Antoine Couëtte <antoine.m.couette@club-internet.fr>
To: pmh099@yahoo.com
Sent: Friday, April 19, 2013 7:03 AM
Subject: [NavList] Re: USCG Sample Problem #2 for Southern Hemisphere
RE : http://fer3.com/arc/m2.aspx/USCG-Sample-Problem-2-for-Southern-Hemisphere-Rudzinski-apr-2013-g23605
Good Day Greg,
You should be soon waking up ... therefore you need some reading ! :-)
At 10:00 LT, i.e. 20:00 UT, I find the following position :
S 09°41'8 W 152°43'7 with a LOP's dispersion of 0.1 NM (Excellent !)
This result - subject to crosscheck with Peter Hakel (see " http://fer3.com/arc/m2.aspx/Group-Project-USCG-student-sample-problems-Couëtte-apr-2013-g23607 " ) - seems within 1 NM from your result.
Best Regards
Kermit
PS : May I suggest that there should be one example with a Southern Declination CIRCUMPOLAR Star with a Local Time somewhere between 180° and 270° ? As I can recall from previous practice (many many moons ago) the heights interpolations from the HO tables require extra care
under such situations. This would involve building up one other example ... if you think this idea is OK, I can build it up.
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