The reason is that the length of the apparent solar day (the time between meridian crossings of the sun) depends on both the rotation of the earth around its axis (which is essentially constant), and the orbital speed of the earth.
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that the length of the apparent solar day (the time between meridian crossings of the sun) depends on both the rotation of the earth around its axis (which is essentially constant), and the orbital speed of the earth
on both the rotation of the earth around its axis (which is essentially constant), and the orbital speed of the earth