Aristarchus -

Aristarchus's methods were mathematically sound, though his results were limited by the imprecise observational tools of his era.

While most of his writings are lost, his legacy is preserved through the works of others like Archimedes. aristarchus

: He theorized that the Sun and fixed stars remained stationary while the Earth rotated on its axis daily and revolved around the Sun annually. Aristarchus's methods were mathematically sound