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On 1/31/11, Patrick Goold  wrote:
> Fred, Hewitt, Gary,
> Thanks for your comments!  They are very helpful.  I am encouraged to think
> that I am getting the hang of this but also chastened that I need to be more
> careful.
>
> I am embarrassed by the inexplicable subtraction error that Gary caught.
> When corrected, the result is an intercept very near the one given by the
> on-line calculator.
>
> Treating the first sight as an upper limb instead of a lower brings that
> value right into line with the others.  I can't imagine how I would have
> made that mistake.  Given the combination of filters I use on the sextant
> itself and on the artificial horizon, the image reflected by the AH and the
> image reflected from the index mirror are different colors.  Orange over
> green for a lower limb.  Could I really have inverted that without
> noticing?  But there is no denying the observation looks much, much better
> on the assumption that that is what happened.
>
> Jeremy, I will try spreading out my shots.  I am using an artifical horizon,
> though.   That limits how low one can observe.
>
> Thank you all again for your help.
>
> Best regards,
> Patrick
>
> On Mon, Jan 31, 2011 at 9:50 AM,  wrote:
>
>>  I will look at your shots in my next exchange Patrick, but I will suggest
>> spreading your shots out a bit more to give a better cut of the lines.   I
>> would give at least 2 hours, and preferably three between observations so
>> that there is larger change in azimuth.
>>
>> Jeremy
>>
>>
>>
>>
>

   

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