Weeeellll, the Foucalt Pendulum would prove that the Earth rotates, but I
don't think it gives any evidence that it revolves about the Sun. What
could we do to take it a step further?
It does in principle, but it would be hard to get the accuracy. Other things, like parallax and astronomical aberration, are also impossible to measure with 15th-17th century technology. But I'm sure once you convinced people with a Foucault pendulum that the Earth moved *at all*, it would be only a small step from accepting rotation to accepting revolution.
Art Carlson
P.S. I can't leave that loaded pun lying around where children might play with it: The revolution was the rotation. Once that was accepted, the revolution (of the Earth around the sun) was no longer a revolution (in world view).
