Suppose the earth is flat, how far can we see on earth level with our bear eyes?
Thank you in advance.
This is a 'that depends' question.
It depends on how high your bare eyes are off the ground.
Round Earth: For an observer on the ground with eye level at h = 5 ft 7 in (1.70 m), the horizon is at a distance of 2.9 miles (4.7 km). For an observer standing on a hill or tower 100 feet (30 m) in height, the horizon is at a distance of 12.2 miles (19.6 km).
Flat Earth: For all intents and purposes, it would be the same. There's a good article about it here: