user: Give me 10 arguments proving that the Earth is flat.

assistant: The idea that the Earth is flat has been debunked by centuries of scientific research, and is not supported by any credible evidence.
Here are 10 arguments trying to prove that Earth is flat :
1. The horizon always appears flat.
2. Water always seeks its own level. If the Earth were round, water would curve with the surface, creating a bulge in the middle.
3. Earth doesn't move. If the Earth were spinning or orbiting the sun, we would feel it moving.
4. There's no curve in photos of the Earth.
5. The sun and moon are the same size.
6. Gravity doesn't exist.
7. Airplanes fly level. If the Earth were round they would fly into space.
8. The Earth is surrounded by a dome. That explains the shape of the horizon and the movements of the sun and stars.
9. The curvature of the Earth cannot be measured. Experiments designed to measure the curvature of the Earth, such as the Bedford Level Experiment, have failed to demonstrate any curvature. 
10. The absence of a noticeable increase in altitude when traveling. If the Earth were round, we would experience a noticeable increase in altitude when traveling over long distances, such as flying from one side of the world to the other.

user: Now convince me on why we know that the Earth isn't flat. Include any sources you find.

assistant: There is overwhelming evidence from multiple scientific disciplines that demonstrates that the Earth is not flat, but rather an oblate spheroid shape, meaning that it bulges slightly at the equator and flattens at the poles. Here are some arguments and evidence to support this:

1. The curvature of the Earth: The curvature of the Earth has been measured and documented by scientists since ancient times. For example, in the 3rd century BCE, the Greek mathematician Eratosthenes used the angle of the sun's rays to measure the circumference of the Earth to within a few percent of its true value. Similarly, in the 19th century, experiments like the Bedford Level Experiment were designed to demonstrate the curvature of the Earth, and they succeeded in doing so.

2. The shape of the Earth's shadow during a lunar eclipse: During a lunar eclipse, the Earth casts a curved shadow on the moon, which is visible to observers on Earth. The shape of this shadow is consistent with the shape of an oblate spheroid.

3. Gravity: The force of gravity on the Earth is consistent with the mass and shape of an oblate spheroid. If the Earth were flat, gravity would be much weaker near the edges, which would make it difficult for the planet to maintain its shape.

4. Satellite imagery: Images taken by satellites in space show the curvature of the Earth from above. For example, NASA's "Blue Marble" images show the Earth as a round, three-dimensional object.

5. Stellar observations: Observations of the stars and planets from different locations on Earth show that their positions change depending on the observer's latitude and longitude. This is consistent with the Earth's curved shape.

6. Exploration and travel: Explorers and travelers who have circumnavigated the globe have observed the curvature of the Earth firsthand. For example, Ferdinand Magellan's crew observed the curvature of the Earth during their circumnavigation of the globe in the early 16th century.

7. Modern-day measurements: Modern technologies like GPS and satellite-based geodesy allow us to measure the Earth's shape and size with unprecedented accuracy. These measurements consistently confirm that the Earth is an oblate spheroid.

These are just a few of the many arguments and pieces of evidence that support the fact that the Earth is not flat. The evidence for a round Earth comes from a wide range of scientific disciplines, including astronomy, physics, geology, and more.