Concept:Proofs of the Earth's spherical shape are observed phenomena that can be explained only if the Earth is round.
Explanation:A lunar eclipse is a proof because the Earth casts a curved shadow on the Moon.
An aerial photograph is a proof because it shows the curved horizon of the Earth.
Twilight and dawn are also proofs: as the spherical Earth turns, sunlight scatters through the atmosphere before the Sun rises and after it sets.
Sunrise and sunset, on the other hand, only show that the Earth rotates on its axis.
They do not confirm that the Earth is spherical in shape.
Answer:Option D: sunrise and sunset is not a proof that the Earth is spherical.