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Old list. Dec 2003, Jan 2004.  Maybe Nov 2003.


On Apr 19, 2007, at 4:10 PM, Alexandre E Eremenko wrote:

>
>
> Dear Fred,
> Thanks for your encouraging message.
>
>> Your findings also dovetail with Jan
>> Kalivoda's report of the findings of a German who investigated
>> precision of lunars at sea in the late 1800s.
>
> Can this be found? Was this on the old list or on a new one?
>
>> standard deviation of lunar distance reported by Jan was about 25
>> arcseconds.
>
> That is 0'.4. I am very interested, how exactly this was studied.
>
>> I am wondering how much practice you estimate it took you to achieve
>> this level of proficiency?
>
> Probably several thousands individual shots (star-to-star and Lunar
> distances). 4 standard student notebooks of records.
> And a lot of thinking about the reasons of errors.
> I am constantly doing this for about 3 years, since I bought my
> SNO-T. I mean almost every evening with clear sky...
> well perhaps 1/2 of all evenings with clear sky:-)
>
> I reported my results from time to time, good and bad.
> From the very beginning I had occasionaly very good results,
> but some were bad.
> And this was unpredictable. Gradually the proportion of good results
> increased... by 2007 it increased to a reasonable level:-)
>
> Right now I looked into the records of a year ago.
> About 1/2 of all shots were within 0'.3 limit
> and another half 0'.4-1'. Some had even more than 1',
> but these were not frequent.
> I used to blame my sextant...
>
> Now it is much better. And I think that the sextant is very good
> after all.
>
> Alex.
>
>
> >



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