That’s missing the point. There are various means of calculating the sum that don’t require telescopes (Aristarchus used Hipparchus' calculation of the Earth-Moon distance, who in turn used Eratosthenes' calculation of the Earth's circumference to calculate the Earth/Sun distance for example); mistakes or faking of the answer would require a global conspiracy or incompetence of such enormity and robustness as to put us in “dragon in the garage” territory etc.
Aristarchus' value was wrong by a factor of of nearly 62 in terms of Earth radii and that would be compounded by whatever error was in Eratosthenes measurement (we don't know for sure because we don't know for sure exactly how long a stade is).
To get the number 93 million miles that you quoted requires heavy investment in scientific technology including at the very least good telescopes in order to calculate very small parallax values and ideally rocket ships to take laser reflectors to the Moon to get a really good estimate of the Earth-Moon distance.
The point though is that all these various and independent methods coalescing on the same answer probabilistically give us a much higher truth value than the unqualified assertion of, say, “there’s a dragon in my garage”.
And my point was that, although, in principle, you and I can replicate the observations, in practice, we trust the scientists to get it right and we trust the scientific method to correct them when they get it wrong.
Sriram tried the going nuclear option of “we can’t know anything with certainty in any case” as if that made all truth claims epistemologically equal, and I was just explaining to him why they’re not.
I don’t suppose it’ll register though.
I agree. There are degrees of certainty. The triangle thing is absolute. The dragon in the garage is not absolute but, I could be as near as dammit certain if I had ten minutes access to your garage. Also there are various reasons why dragons as described by most mythology would be extremely unlikely.
The Earth's orbit is a different thing because it is a measurement and there will be a margin of error associated with it that. If we take 93 million as the mean distance, it's wrong but we know it is pretty close to the true distance. (The Astronomical Unit is defined as about 92.956 million miles.)