The Sun rises and sets because of Earth’s rotation. The Earth and the planets orbit the Sun, but they also spin on their own axis,. The axis is the point from which the planet rotates on. Earth’s axis is tilted, which is what makes seasons! When the Earth spins, different sides of the planet experience daytime and nighttime at different times. For example, it may be night in the U.S., but it might be daytime in Japan. The Sun only appears to rise and set because of the Earth’s rotation. Different parts of the Earth are exposed to the Sun and to darkness at different times because of Earth’s rotation. That is why the Sun rises and sets.