Why does the sun rise in east and sets in the west?

The sun rises in the east and sets in the west due to the rotation of the Earth on its axis from west to east. This rotation causes the sun to appear to move across the sky from east to west. The Earth's rotation also creates the illusion of the sun rising in the east and setting in the west, even though it is actually the Earth that is moving.

The sun does not actually "rise" or "set". These are simply terms used to describe the apparent motion of the sun in the sky as seen from Earth. The sun is actually a stationary star that is much larger than Earth. The reason the sun appears to move across the sky is because of the rotation of Earth on its axis. As Earth rotates, different parts of the planet are exposed to the sun's light, giving the illusion that the sun is moving.

The direction in which the sun appears to rise and set depends on an observer's location on Earth. For an observer in the Northern Hemisphere, the sun will appear to rise in the east and set in the west. This is because Earth is rotating from west to east, so the eastern horizon is the first part of the planet to be exposed to the sun's light. For an observer in the Southern Hemisphere, the sun will appear to rise in the west and set in the east. This is because Earth is still rotating from west to east, but the observer is located on the opposite side of the planet.