Write three proofs to show that the Earth is round.
- Ship’s hull disappearing: As a ship sails away from an observer on a flat surface, it eventually disappears from the bottom up. This happens because the Earth’s surface curves away from the observer, making the ship appear to sink lower into the water until it disappears.
- Lunar eclipses: During a lunar eclipse, the Earth’s shadow can be seen on the surface of the moon. The shape of the shadow is curved, indicating that the Earth is round.
- Travelling in different directions: If someone travels in different directions, they will eventually end up back where they started. This is only possible on a curved surface, like a sphere.