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----- Original Message -----
From: "Jim" 
To: "NavList" 
Sent: Thursday, October 25, 2007 1:52 PM
Subject: [NavList 3586] Appeal to forum members to collect data


>
> I would like to collect some data from a variety of observers using a
> variety of marine sextants taken in a uniform manner.
>
> What I am proposing is to collect data using the following method:
>
> 1. Take 5 observations (moon and sun, star or planet) standing on
> land. No graphing, just 5 raw observations.
>
>
> 2. Record name of observer, sextant used, power of sextant scope, GMT,
> date, Lat and Long, name of body used, distance (corrected with IE),
> barometric pressure, temperature, error in each observation (in
> minutes)
>
>
> 3. I would propose using Frank's online calculator to evaluate the
> error in each observation using the known lat and long and letting it
> calculate the heights of the moon and body observed.
>
>
> 4. Angular measurements reported in whole degrees and minutes rounded
> to the nearest 0.1'.
>
>
> 5. Make the observations in good conditions and with the moon and body
> 15 degrees or more above the horizon.
>
>
> 6. Submit the results to me and I will accumulate the data in tabular
> form. I could provide an Excel template to use or the results could be
> sent in a set text format.
>
> My ambition in doing this would be to have some clear cut answers to
> the accuracy and precision questions that come up. What I have found
> is that although there have been many postings on the topic, there is
> always some question as to how the observation(s) were taken, the
> method of evaluation used or what almanac data was used.
>
> Once in electronic format we could proceed to analyze the data in a
> multitude of ways.
>
> I would invite comments on this proposal at this point and will remain
> hopeful that a few people out there would like to join the endeavour.
>
> Jim
>
>
> >
>


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