Sure, here are seven observations that disprove the flat earth theory:

- The horizon always appears to be at eye level regardless of your altitude: If the earth were flat, the horizon would dip downwards as you ascend, but this is not the case. Instead, the horizon always appears to be at eye level, which suggests that the earth is curved.

- The appearance of ships at sea: As a ship sails away from shore, its hull disappears from view first, followed by the mast. This is because the ship is gradually disappearing over the curvature of the earth.

- The curvature of the earth can be seen from high-altitude photos and videos: Astronauts on the International Space Station have taken photos and videos that clearly show the curvature of the earth.

- The earth's shadow during a lunar eclipse: During a lunar eclipse, the earth casts a circular shadow on the moon. If the earth were flat, the shadow would appear as a straight line.

- The Foucault Pendulum: The Foucault Pendulum is a simple experiment that demonstrates the earth's rotation. The pendulum swings in a predictable pattern that would not occur if the earth were flat.

- The behavior of gravity: Gravity behaves as if the earth were a sphere, with the force of gravity decreasing as you move further away from the center. This would not be the case if the earth were flat.

- Time zones: Time zones exist because the earth is round and rotates on its axis. If the earth were flat, it would be impossible to explain the differences in time between different regions of the world.

These are just a few observations that contradict the flat earth theory. There are many more, but these are some of the easiest to understand and explain.
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