My understanding of cosmology and astronomy is there is an inherent "ladder", nesting of assumptions, or indirect argument structure. Like, IF the Moon is a sph

My understanding of cosmology and astronomy is there is an inherent "ladder", nesting of assumptions, or indirect argument structure. Like, IF the Moon is a sphere, then by the shadows Earth leaves upon it during eclipses, Earth is a sphere. This reasoning came before Aristotle knew the Earth was sphere. https://youtu.be/7ne0GArfeMs?t=632 https://youtu.be/7ne0GArfeMs?t=632 This is still a way to do science. I'm willing to believe the experimenters dealt with the inherent novelty in a scientific way. What do you mean known celestial body?? We've only ever "been" to 2. We don't get to run all the experiments you'd like. As long as the process is self-correcting, it works. You have not shown this method to be uncorrecting. Better and better standards are used to strengthen these claims. And it is expected some degree of future corrections will occur. That's the nature of the beast.