The angle of inclination of the Earth's axis with its orbital plane is known as the axial tilt or obliquity. It refers to the tilt of the Earth's axis in relation to its orbital plane around the Sun. This tilt is responsible for the changing seasons and the varying lengths of daylight throughout the year.

The axial tilt of the Earth is approximately 23.5 degrees. This means that the Earth's axis is tilted at an angle of 23.5 degrees with respect to the plane of its orbit around the Sun. This angle remains relatively constant over long periods of time, although it does undergo small variations due to factors such as gravitational interactions with other celestial bodies.

The axial tilt plays a crucial role in determining the Earth's climate and seasons. As the Earth orbits around the Sun, different parts of the planet receive varying amounts of sunlight throughout the year. During summer, the hemisphere tilted towards the Sun receives more direct sunlight, leading to warmer temperatures and longer days. In contrast, during winter, the hemisphere tilted away from the Sun receives less direct sunlight, resulting in colder temperatures and shorter days.

Key Points:
- The axial tilt of the Earth is the angle between its axis and its orbital plane around the Sun.
- The Earth's axial tilt is approximately 23.5 degrees.
- The axial tilt is responsible for the changing seasons and the varying lengths of daylight throughout the year.
- During summer, the hemisphere tilted towards the Sun receives more direct sunlight, leading to warmer temperatures and longer days.
- In contrast, during winter, the hemisphere tilted away from the Sun receives less direct sunlight, resulting in colder temperatures and shorter days.

In conclusion, the angle of inclination of the Earth's axis with its orbital plane is approximately 23.5 degrees. This tilt is responsible for the changing seasons and the varying lengths of daylight throughout the year. It plays a crucial role in determining the Earth's climate and has a significant impact on our daily lives.

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