NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Greg Rudzinski
Date: 2013 Apr 23, 09:21 -0700
Antoine,
You and Peter have pointed out correctly the problem Sun line reduction for 2 June 2013.
>"1 - 02 JUNE 2013
>RE : " https://NavList.net/m2.aspx/Group-Project-USCG-student-sample-problems-Rudzinski-apr->2013-g23582 " further corrected into :
>" https://NavList.net/m2.aspx/Group-Project-USCG-student-sample-problems-Rudzinski-apr-2013->g23599 " after first feedback from Peter Hakel.
>I confirm all corrections first and earlier indicated by Peter.
>However for the 01:59:04 UT SUN observation, Greg, I am getting an Intercept of 8.9 NM TO (vs. your >- uncorrected ?? - value of 17.0 T) while we are both getting the same Azimuths (Az = 283.4 °)."
To remedy this I have looked at my original notes which shows a UT 1:59:40 for 2 June 2013. Reworking using USNO shows quite a few changes which are shown highlighted on the attachment. There was a change in GHA, assumed longitude, Hc, Hs, Ho, and intercept. This should fix things I hope.
Regarding Polaris. The Pub 249 reduction uses a Q value and a precession nutation correction that are rounded to the nearest minute of arc. I would not expect a close match to USNO or other programs.
Thanks for the checks.
Greg Rudzinski
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