* Angular Velocity: The apparent motion of stars across the sky is due to the Earth's rotation. While the Earth rotates at a constant rate, the *angular velocity* of a star (how fast it appears to move across the sky) depends on its altitude. Stars near the horizon have a higher angular velocity because they are moving across a larger arc of the sky. Stars high in the sky have a lower angular velocity because they are moving across a smaller arc.
* Perspective: Our perception of motion is also influenced by perspective. Stars near the horizon are close to objects on the ground, which act as reference points. This makes their apparent movement more noticeable. Stars high in the sky have fewer reference points and appear more distant, making their motion less obvious.
* Atmospheric Distortion: The Earth's atmosphere can also distort the appearance of stars, especially those near the horizon. This distortion can further mask their motion.
In summary: The combination of lower angular velocity, fewer reference points, and atmospheric distortion makes it harder to perceive the westward motion of stars that are high in the sky compared to those near the horizon.
