On Friday, April 27, 2018 at 11:20:03 AM UTC-6, palsing wrote:

Gerald does not understand that if someone were to be living on the 'back' side
of the moon he would not even be aware of the Earth's existence, but he would
nevertheless see the Sun and stars rise and set... and using the exact same
logic as Earthbound scientists, would eventually determine that he was orbiting
the Sun every year and rotated on his own axis every month or so...

Now that's an interesting way to look at it.

John Savard