The correct answer is: 23.5 degrees.
The Earth’s axis is tilted at an angle of 23.5 degrees relative to the plane of its orbit around the Sun. This tilt is responsible for the seasons.
During the Northern Hemisphere’s summer, the Northern Hemisphere is tilted towards the Sun, and the Southern Hemisphere is tilted away from the Sun. This means that the Northern Hemisphere receives more direct sunlight, and the days are longer. During the Northern Hemisphere’s winter, the Northern Hemisphere is tilted away from the Sun, and the Southern Hemisphere is tilted towards the Sun. This means that the Northern Hemisphere receives less direct sunlight, and the days are shorter.
The Earth’s axis is also precessing, which means that it is slowly wobbling like a top. This precession takes about 26,000 years to complete.
The Earth’s axis tilt and precession are caused by the gravitational pull of the Sun and the Moon. The Sun and the Moon pull on the Earth’s equatorial bulge, which causes the Earth’s axis to tilt. The Earth’s precession is caused by the gravitational pull of the Sun and the Moon on the Earth’s equatorial bulge, as well as the gravitational pull of the other planets in the solar system.
The Earth’s axis tilt and precession have a significant impact on the Earth’s climate. The Earth’s tilt causes the seasons, and the Earth’s precession causes the Earth’s climate to change over time.