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Earth’s tilt causes different amounts of daylight throughout the year. Earth is tilted on its axis, so as Earth revolves around the Sun, different parts of Earth get more or less direct sunlight. When the northern hemisphere gets the most direct sunlight, we experience summer. When we get the least direct sunlight, we experience winter. When the amount of sunlight is fairly even, we experience spring and fall.
The apparent path of the Sun changes with the seasons. Each season brings a change to the number of hours of daytime and the height of the Sun’s path. During the summer, the Sun reaches its highest path in the sky, causing more daylight hours. The Sun’s lowest path happens during the winter, creating longer nighttime hours. The Sun’s path is between the two extremes in spring and autumn, resulting in an equal number of day and night hours. The cause of the seasonal change in the path of the Sun is the combined effect of Earth rotating at a 23.5 degree tilt while revolving around the Sun.
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