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https://files.catbox.moe/dipkpn.png

Parallax comes down to an equation with an observer and two objects. Take the distance between the observer and object A. Now multiply that number by two and place object B at that distance.

A quick example would look like this.

A @ 10ft or 500ly

B @ 20ft or 1000ly

It does not matter if it's 20 ft or 1,000 light years. The parallax effect is dictated by these two different numbers and can scale to any number.

So if we were to say that object A is a star at 500ly away. We can still take a timelapse photo of it and see the star trail which is just a recording of its apparent movement relative to our position on the moving Earth. We can print out that timelapse photo and measure how long of a star trail object A made. Let's say in the photo object A made a star trail that was 1" long. If object B is another star at 1000ly away, You would take the apparent distance that object A traveled on your photo and divide it by two. Now you should be able to measure the star trail that object B made. It should be 1/2". If it's not, then at least one of the numbers for distance is incorrect. If the stars show no movement at all relative to each other, then it means those stars are at the same exact distance from the observer. So basic observation and by the laws of perception, the stars in the night sky are a blanket.

Here's a post I made not only debunking the ridiculous claim that Eratosthenes proved the earth was round in 240 BC but I also proved the earth is flat.

https://www.upgoat.net/viewpost?postid=65f2576a41573