Why does the Sun appear to move across the sky daily?

The Sun appears to move across the sky daily primarily due to the Earth's rotation on its axis. As the Earth spins from west to east, different regions of the planet experience sunlight at various times, creating the illusion that the Sun itself is moving across the sky. This rotation takes approximately 24 hours to complete, which is why we observe the Sun rising in the east and setting in the west.

In contrast, the notion that the Sun moves around the Earth is a misconception that was historically held before the heliocentric model of the solar system was established. The stars, while they do move, do not cause the daily motion of the Sun; instead, their apparent movement is a much slower process over the course of the year due to Earth's orbit around the Sun. The Moon's rotation does not significantly impact the Sun's apparent movement through the sky, as the Moon's effects are primarily associated with tides and other phenomena.