Unless you live directly on the equator the length of the day will change throughout the year. Since the Earth is tilted on it’s axis, part of the year one hemisphere is closer to the sun and then they switch. This is what causes the seasons as well. While our part of the world is tilted toward the sun the days are longer and it takes more to for the sun to rise and set which would be during the summer. During the winter we’re tilted away from the sun and it has the opposite effect. The closer you get to the pole the great this change, so in Antarctica you have several months of darkness during the winter and several months of sun in the summer.
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