If it can't be subsequently verified, it will have to be rejected.
Theories simply stand until disproved, or until they are seen to have limits.
About 200 BC, Eratosthenes used Aristotle's ideas to calculate the size of the Earth. On a certain day of the year, observers at Syene, Egypt saw the sun directly overhead. The angular displacement was measured. Using simple geometry, he calculated the circumference and the radius of the Earth . The result was within 1 percent accuracy of the figure known today.