There was limitations in Copernicus work, and the work of those before him, many who yes, got their work turned on its head. (those who thought the sun revolved around the earth, etc.) But if nothing's been falsified since the very primitive days of Copernicus and Galileo, 500+years, then it's safe to say that astronomy is too vague to be falsifiable.
Oh, it's worse than that. In thousands of years, no-one's falsified the claim that the Sun exists. Therefore this claim is "too vague to be falsifiable", and so is unscientific.
Either that or you have no idea what you're talking about. Yeah, that could be it.