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Concern made by Eddie Jones: If the world were an infinitely large perfectly flat plane, would we still have a horizon?
According to Paul Walorski on physlink.com: “…there’s a horizon, meaning that the surface that one is observing from is not an infinite plane…”
http://www.physlink.com/education/askexperts/ae535.cfm
Surely he is wrong? Surely if the world were an infinitely large perfectly flat plane there would still be a horizon, if horizon is defined as “the line at which the earth’s surface and the sky appear to meet”?
This can be focused on If the world were an infinitely large perfectly flat plane, would we still have a horizon? you will need to have to clear up issues in their own business. Preferably it will aid in lots of ways, and making everything much better. Who wish focused on If the world were an infinitely large perfectly flat plane, would we still have a horizon? are likely to be a response in the near future.
Best answer:
Answer by Steve4Physics
I agree with you. If you looked horizontally, the horizon would appear to be straight ahead – perfectly level with your eyes.
However, it wouldn’t be a sharp line, the ground would ‘fade out’ having zero visibility at the horizon; the horizon would be a sort of asymptote’, not a distinct line.
Answer by Dan
a horizon is just a view to the next bus stop, not really anything to do with infinity.
Answer by Misesean X
But if you get a telescope, the “horizon” would be further away; it’s not a true horizon, just a perspective effect. The horizon you see on Earth is much closer than that, too.
{If your infinite plane existed in an expanding universe, there would still be a horizon, though: at some distance, photons emitted beyond that distance would never reach you due to relativistic effects … essentially the same thing as the event horizon of a black hole}
The article is totally wrong when he says “hundreds of years ago … it was generally believed that the world simply *stopped* at the end of the horizon”, though … the ancient Greeks knew the Earth was round 1700 years before Columbus, and even had a reasonable approximation of its size; no sane person thought the Earth was flat, let alone stopped at the horizon (which would mean places they’d /visited/ didn’t exist) … people thought Columbus was nuts not because they thought the Earth was flat but because they knew it was too big for him to reach India before running out of food — which he would have, if he hadn’t run into America.
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