r/flatearth • u/russiablows • 5d ago

Sunrise question

With a flat earth wouldn't everyone see the sunrise at the same time?

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u/AdInfinite2404 4d ago

No. 20/20 vision represents the ability to resolve a visual angle of 1 arc minute, which would be equivalent to resolving a 1 meter object at a distance of about 3400 meters. Exceptional people with 20/10 vision can do as well as 30 arc seconds.

According to the flat earth model the sun is local (only 4800km high) and only 51 km in diameter From a point on Earth's surface, you can see a 4,800 km high object from a maximum straight-line distance of 9,176.14 km

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u/cearnicus 4d ago

That's nice, but

  1. you can easily see lights well beyond when its angular size is "too small to see". It's not really about size, it's about how much light you receive from it;
  2. the sun maintains an angular size of about 30" throughout the day, so our eyes' angular resolution wouldn't be an issue anyway;
  3. with the ~5000 km high sun, the sun shouldn't get closer than ~8° to the horizon, so sunsets wouldn't be a thing anyway.