Yeeeess, 1+1=2 is true at the same time as 2+2=4 is true and so one to infinity. I don't think that's what you are talking about. But you agree that 1+1=2 is true and it is not true that 1+1=3?
You mean, sometimes we think something is true and it turns out it isn't? Ok. Is that a reason to doubt that the earth goes around the sun?Secondly, I think that -using your example of astronomy, things can be and are disproven, then replaced by another "truth".
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