In short, Life! We only really live because the earth is tilted on it axis so it regulates heats.
About 17 degrees.
The number of hours of sunlight changes as the earth revolves around the sun because the earth revolves around the sun tilted. Depending on the position of the earth in relation to the sun will determine the number of hours of sunlight emitted towards earth.
This is because (a) Earth revolves around the Sun, (b) Earth's axis is tilted, and (c) roughly speaking, and as a first approximation, Earth's axis maintains its direction in space.
Uranus is the large planet that revolves around the sun tilted on its side. Its rotational axis is tilted at an angle of about 98 degrees, causing its poles to point nearly toward and away from the sun at different points in its orbit.
Seasons change because the Earth revolves around the sun in a period of one year; you have the southern hemisphereand the northen hemisphere of the Earth. Earth is tilted with respect to its orbit around the sun. So when our North Pole is tilted toward the sun, we get summer in the Northern Hemisphere (winter in the south). When the South Pole is tilted toward the sun, we get winter. So if a planet is tilted with respect to its orbit around the sun, it should have seasons
We have different seasons because the Earth is tilted at 23.5 degrees. The earth also revolves around the sun and that takes 365.25 days.
We have seasons because Earth is tilted on its axis and it revolves around the sun. During May, June, and July, the northern hemisphere is exposed to more direct sunlight because the hemisphere faces the sun. The same is true of the Southern Hemisphere in November, December, and January. It is the tilt of the Earth that causes the Sun to be higher in the sky during the summer months.
The reason why we have seasons, is because the earth is tilted on it's axis. As it revolves around the sun, the tilt will lean towards the sun in the spring and summer and leans away from it for the fall and winter.
An object, once rotating, tends to maintain the direction of its rotational axis in space.
Earth's seasons are primarily caused by its axial tilt and its orbit around the Sun. As Earth revolves around the Sun, different regions receive varying amounts of sunlight at different times of the year due to this tilt. This results in the changing seasons: summer occurs in the hemisphere tilted toward the Sun, while winter occurs in the hemisphere tilted away. The combination of axial tilt and orbital position leads to the seasonal variations in temperature and daylight.
The tilt is the reason that we have seasons. Many living things' life cycles revolve (no pun intended) around the changing of the seasons.
Summer occurs on the hemisphere of earth that is tilted towards the sun.