FWIW: I found the English version of that website https://www.date-and-time.net/

The graphics are pretty good, if you open the images directly you can play around with the parameters in the URL.

From all effects discussed is earth's axial tilt of 23 degrees the main factor, all the others are marginal.

Try winter solstice for the same latitude and you'll see how the days become shorter the closer you reach the north pole, till you have polar night.

That's the opposite at summer solstice, days become gradually longer till you have polar day.

Try the same location with different dates and you'll see how the curve is seemingly rising and dropping by 2*23° during the year. ( See Sun_path )

Here the images for equinox in Rome,

Note how the altitude at noon is exactly 90°- 52.5° (your latitude)

That's why the curve when approaching the pole must become always flatter till it's a line

Together with the variation of altitude of +- 23 ° during the year the curve is rising and falling from the horizon.

Different curves = different sun hours for same latitude.

Cheers Rolf
(addicted to the Perl Programming Language :)
see Wikisyntax for the Monastery

Update

I don't think the graphs are correct for the southern hemisphere. Sun should wander in the north.

In reply to Re^2: [OT] Astronomical puzzling about daylight hours at different latitudes by LanX
in thread [OT] Astronomical puzzling about daylight hours at different latitudes by Discipulus

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