Agree with jleahy. I would add that considering counterfactual situations like "if the sun were to move instantly to the right" is of limited utility. That can

Agree with jleahy. I would add that considering counterfactual situations like "if the sun were to move instantly to the right" is of limited utility. That cannot happen (violates conservation of momentum). (Granted, other thought experiments have been quite influential in this field...)