Here's a breakdown:
* Earth's Tilt: Earth is tilted on its axis at approximately 23.5 degrees. This tilt means that different parts of the Earth receive varying amounts of sunlight throughout the year.
* Summer Solstice: During the summer solstice (around June 21st in the Northern Hemisphere), the North Pole is tilted towards the Sun. This means the Northern Hemisphere receives more direct sunlight and experiences longer days. The Sun appears to take a longer path across the sky, resulting in longer daylight hours.
* Winter Solstice: During the winter solstice (around December 21st in the Northern Hemisphere), the North Pole is tilted away from the Sun. The Northern Hemisphere receives less direct sunlight, leading to shorter days. The Sun appears to take a shorter path across the sky, resulting in shorter daylight hours.
* Equinoxes: During the spring and autumn equinoxes (around March 21st and September 23rd), the Earth's axis is neither tilted towards nor away from the Sun. This means both hemispheres receive roughly equal amounts of sunlight, leading to approximately 12 hours of daylight and 12 hours of darkness.
In summary: The changing length of daylight hours throughout the year is a result of Earth's tilt, which causes different parts of the Earth to receive varying amounts of direct sunlight as the planet orbits the Sun.
