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I notice now that as a result of my sunset observations my reasoning
was too much focused on the horizon where the sun, depending on the
latitude, moves at constant slope. The only changes one can notice
there are the changes in azimuth resulting from the changes in
declination. I understand now that the much larger effect, which the
graph reveals, results from how the movement of the sun is projected
at the observer, it's thus a pure geometrical feature.

Marcel

   

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