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RE : http://fer3.com/arc/m2.aspx/USCG-Student-Sample-Problem-4-Rudzinski-apr-2013-g23675

Hello Greg,

Hard to keep up with all your many publications ... , especially after the delicious BBQ and Beverages in Prisoners Harbour ! :-)

A few comments about your Sample Problem #4

I first compared your Celestial Coordinates values with the ones I have derived : they all fit within 0.1' . Very Good !

I then computed the Intercepts and Azimuths from your various Auxiliary Positions.

The 3 Stars intercepts are within +/- 0.1' and Azimuths are the same.

For the SUN I find i = -19.8' / AZ = 126°2 , vs. your published result i = - 20.0 / AZ = 126.2°

Nothing to really worry about this 0'2 difference between these SUN intercepts. It still remains a bit surprising given the otherwise excellent match between all the other Stars intercepts.

I have (again) computed an Observed position at 06:00:00 LT through a software which automatically updates the DR Positions to each observation time. I am getting the following results :

UT 20:00:00 / N 25°09'9 / E 143°49'6 , with a LOP's dispersion of 0.1 NM (Excellent !).

This position seems to be quite close (certainly within 1 NM) from your graphic determination.

As a conclusion - and with the exception of the minor comment about the SUN intercept - I can see that our results are essentially the same.

Thank you again and

Best Friendly regards

Kermit
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