Here's why:
* Solar Day vs. Sidereal Day: A solar day is the time it takes for the Sun to appear in the same position in the sky. A sidereal day is the time it takes for the Earth to complete one full rotation on its axis relative to the stars.
* Earth's Tilt: The Earth is tilted on its axis. This tilt causes the length of daylight hours to vary throughout the year.
* Winter Solstice: On the winter solstice, the Northern Hemisphere is tilted furthest away from the Sun. This means the Sun appears to be at its lowest point in the sky, resulting in the shortest day and longest night of the year. However, since the Earth's orbital speed is not constant, the solar day on the winter solstice is actually the *longest* of the year.
While the winter solstice has the shortest amount of daylight, it has the longest solar day because the Earth's speed around the Sun is slightly slower at that point in its orbit.
