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Subject: Re: On improving data
From: Dan Allen (danallen46@XXX.XXX)
Date: Fri Jan 17 2003 - 13:30:11 EST
On Friday, January 17, 2003, at 10:17 AM, Peter Fogg wrote:
> The rate a celestial body appears to rise or fall over a 5 minute
> period
> can be expressed as a sloping line on a graph. If the sights taken (as
> many as possible of the same body over the 5 minutes*) are plotted
> above
> this line then a second line can be drawn parallel which best fits the
> pattern of sights - they should also rise or fall. Then any point along
> this 'line of best fit' can be used for the 'time/sextant altitude'
> data.
> Any sights that are wildly off are ignored, so unlike 'averaging' they
> make no contribution to the result.
Thanks Peter: this is exactly the kind of insight I was looking for!
I'll have to try this on my next round of sights.
Dan
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