A geocentric model is observably incorrect.

The word “planet” is neither true nor false. Different people use it to refer to different things.

Kind of like the word “tree.” Some things are trees and some things are not — and it really depends on whom you ask and when you ask them. Most people are able to get along and allow people to refer to whatever trees they want to, because it’s a free country and it really doesn’t make sense to try to control other people over something like that.