Because your field of vision is a cone. Close up, you only see like a meter from left to right. So a close-by object doesn’t need long to pass through this distance. But in the far distance, your field of view covers kilometers. And naturally, traversing this long distance takes the objects there a while.
From your perspective it appears a if the objects move the same distance at different speeds, but it’s actually that they travel different distances at the same speed.
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