The Earth's tilt during the winter and summer solstices affects day length in the Northern Hemisphere.
During the winter solstice, which occurs around December 21st, the Earth's poles point at the greatest angle away from the Sun, resulting in the shortest day of the year in the Northern Hemisphere. Conversely, during the summer solstice around June 21st, the poles point at the greatest angle toward the Sun, leading to the longest day of the year in the Northern Hemisphere.
Twice a year, at the summer and winter solstices, the Earth's axis is tilted approximately 23.5 degrees from the perpendicular to its orbit around the Sun.
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