Let me explain: I’ve noticed when in a car the curb and poles right next to the car fly past so quick but things start going past slower the further away it is like a mountain it doesn’t move but a house it moves a bit slower than the sidewalk
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This is called “parallax” and is a method your brain uses to tell distances
One way you interpret motion is by the angular shift it makes. How quickly does it move from one side of your vision to another. This makes an angle, with your retina at the vertex.
If the object is close and moving, the angular change is very large in one moment, and so it’s interpreted as closer (all other things being equal).
If the object is far and moving it covers a smaller angle in your vision, and is interpreted as further away.
This is also the most direct way to measure the distance to stars 🙂 We know the speed of earth about the sun, the distance and timing. So we can look out at stars and see how they ‘appear’ to move. Larger angular differences are closer stars.
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