When are the longest and shortest true solar days of the year?

The longest true solar days occur on the days of the solstices, when the rate of change in right ascension of the Sun due to its movement along the ecliptic is greatest, and in December the day is greater than in June, since the Earth at this time is at perihelion.
The shortest days are obviously on the days of the equinoxes. In September, the day is shorter than in March, since at this time the Earth is closer to aphelion.

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