What are six different proofs that the shape of the earth is a sphere?

Answer 1

1. Earth's shadow on the moon (at lunar eclipse) is always circular.

2. The position of the sun and the stars depends on the position on earth, thus earth has to be curved.

3. Magellan sailed around Earth.

4. Yuri Gagarin orbited Earth in space.

5. Pictures of Earth taken from the Moon impressively demonstrate the shape of Earth

6. The rotation of Earth can be proven with Foucault's pendulum

7. Astronomical observations show that all the other planets are spheres, it is very likely that the Earth is a sphere too

Answer 2

1. The curvature of the horizon observed from a high altitude, such as during flights or at sea, is consistent with a spherical shape.
2. The changing positions of constellations as one travels north or south can only be explained by a spherical Earth.
3. Ships appearing to sink hull-first as they sail away is due to the Earth's curvature.
4. The existence of time zones and varying lengths of daylight also support a spherical shape.
5. The way lunar eclipses cast a round shadow on the moon is evidence of Earth's round shape.
6. The calculation of the Earth's circumference based on measurements of shadows at different latitudes supports a spherical Earth.