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Sure - I agree that the data will change depending on the declamation.
But how would that affect the regression calculations - it would affect
the resulting 2nd order curve coefficients but the calculations would
remain the same - true ???  The accuracy or the resulting average would
also be affected - if, in fact, the curve is of higher order than 2, the
error of the average would be expected to be larger.

On Sat, October 13, 2018 21:01, Ron Jones wrote:
> The length of time prior to or after meridian transit that the rate of
> change in the altitude of a body can be considered linear is strongly
> influnced by the difference in the bodies declinaltion and the latitude
> of the observer.  For example on October 13 2018 when the Sun's
> declination is approximately 8 deg. South,  consider the Sun's altitude
> vs time as viewed from latitudes 10N, 20N, 40N, 60N & 80N (see attached
> PDFs).
> Ron      48N   123W
>
>
> [plain text auto-generated]
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> Attached File: http://fer3.com/arc/imgx/10N-Hc-of-Sun-vs-time.pdf
> Attached File: http://fer3.com/arc/imgx/20N-Hc-of-Sun-vs-time.pdf
> Attached File: http://fer3.com/arc/imgx/40N-Hc-of-Sun-vs-time.pdf
> Attached File: http://fer3.com/arc/imgx/60N-Hc-of-Sun-vs-Time.pdf
> Attached File: http://fer3.com/arc/imgx/80N-Hc-of-Sun-vs-time.pdf
>
>
>
> :
> http://fer3.com/arc/m2.aspx/Linear-regression-other-tools-RonJones-oct-201
> 8-g43067

   

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