I will perhaps regret jumping in here but he made an interesting point that I am not sure I heard a reply to. If you replied and I missed it then I apologize ahead of time.
Now, my words not his, but what about the idea that a scientific consensus begins to build around a theory which gains broader and broader acceptance, and this theory becomes a workable model that all future research has to take into consideration. Then there comes a position that has very little acceptance which claims to undercut the very foundation of what most accepted research engages in as a regular enterprise. Is it not incumbent upon this outlier scientific position to present overwhelming evidence to refute what is accepted mainstream science? If I heard his argument correctly it sounded like he was saying that the onus is not on him to prove the majority opinion but rather on you to disprove the majority opinion. You may be Copernicus, and if you are you will be right and everyone else wrong. But to be a good Copernicus you have to present overwhelming evidence to over turn the accepted position or the accepted position stands.
Frankly, your argumentation would make it hard for me to prove to you that the world is round. I am not being snarky I am just admitting my rhetorical limitations if you are going to tell me I cannot appeal to authorities. All of my evidence for the world being round is secondary as well as relying (by faith, if you will) on what text books and authorities say.
Nice post. Thanks for the opportunity to clarify.
I'll start with where you end, on the roundness of the earth. You seem to conflate two things in your last sentence which I'm holding as distinct: evidence (even if secondary) and testimony of authorities. You see, if you can talk, at all, about what you mean when you say round and what evidence you accept for believing in the roundness of the earth, then we can have a conversation about the strengths and limitations of that evidence. In other words, we can talk the science. However, if you are unable or unwilling to even clarify what you mean by round and to mention any evidence in support of the earth's roundness, then I would say that for you the earth's roundness for you is simply a matter of faith.
Still, as I've said repeatedly, there is nothing wrong with accepting the word of authorities by faith. We all do it. Almost all education through 12 grades depends on it. However, we should also be aware of what knowledge we have simply by faith. Your faith can be correct, but it's still faith.
So, now let's back up to your Copernicus reference to add further clarification. Copernicus first published his ideas of the sun-centered solar system in about 1514 and published his fuller treatment shortly before his death in 1543.
Now, imagine the year is 1600, some 60 years later, and someone makes a post on the internet mocking people who deny the Aristotelian/Ptolemaic cosmology which has been the standard model for more than a thousand years. They then make the assertion that this is settled science on which ALL scientists and physicists agree. He further asserts that the overwhelming scientific evidence supports the earth-centered model.
Now, on the one hand, this person in 1600 is correct about what has been the accepted science and about the majority opinion of scientists, and even that there is evidence which support it. Historically, heliocentrism wasn't generally accepted until the 2nd half/end of the 17th century (1600's). On the other hand, his comment also betrays an ignorance of the scientific data and the state of the question. Not only do his comments suggest that he's unaware of the proposal of Copernicus, he's also unaware of the problems that had been plaguing the Ptolemaic cosmology leading up to Copernicus' proposal. Let me say that again: Even cosmologists committed to the Ptolemaic, earth-centered model knew that there were problems with the model as more and bigger epicycles were being proposed and as its predictions were seen as insufficiently precise. So, any claim about overwhelming evidence in support of the Ptolemaic cosmology actually misrepresents the state of what was known in the year 1600. Someone who would've made such claims in 1600 was either ignorant of the science and just speaking from faith in textbook tradition or dissembling.
I'm saying that this is what has been happening here. I have no problem with people saying that they accept the textbook tradition by faith. That's a reasonable thing to do. I do have a problem with people declaring that there is overwhelming support for the theory or that it's settled science when I know that this is not the case. In fact, the textbook theory of evolution (Neo-Darwinism, modern synthesis) is in worse shape with respect to the data than the Ptolemaic Cosmology was in 1600.
However, it is pointless to argue science against a person's faith. As I've begged repeatedly, I am happy to engage in a conversation about the science if someone were to start a thread where they lay out theory and the evidence on which they rely. It is, of course, a waste of time to discuss data and evidence with someone who will respond, "But my Bible (PZ Myers, Jerry Coyne, Richard Dawkins, Ernst Myer) says, "..."