Why Does the Windshield Appear to Move Slowly?

[DiTessa]

The reasons why the windshield appears to move slowly include the influence of angles and distance. The specific explanations are as follows: Influence of Angles: Close one eye. When a long stick aligns with the central line of your vision in front of you, you can only see the end of the stick and have no idea how long it is. When the stick forms a certain angle with your line of sight, you realize it is a stick, but you still cannot accurately perceive its true length—it appears shorter. The smaller the angle, the shorter it seems. Only when the stick is perpendicular to your line of sight can you fully perceive its true length. Influence of Distance: The closer an object is, the greater its angular velocity; the farther it is, the smaller the angular velocity (linear velocity is like the base of an isosceles triangle, distance is the height of the triangle, and the angle between the vertex and the base represents the angular velocity. Clearly, if the base length is the same but the height differs, the size of the vertex angle will vary significantly). For example, when flying in an airplane at high speed, objects on the ground appear to move very slowly because they are too far away, resulting in a very small angular velocity.