Maybe it's very simple but I'm wondering which one is correct. Google search has showed me both forms are used.
- "He said the earth was round."
- "He said the earth is round."
Both the sentences are correct. It depends on what context and which tense you are using it. For example:
Aristotle was the first person who described the shape of the Earth. He said the Earth was round but no one believed him then. However, today it's a known fact.
I asked my professor, "What is the shape of the Earth?" He said, "The Earth is round."