There is something to be said for trusting people’s (or systems of people’s) authority.
For example, have you ever personally verified that humans went to the moon? Have you ever done the experiments to prove the Earth is round?
For example, have you ever personally verified that humans went to the moon? Have you ever done the experiments to prove the Earth is round?
I have, actually! Thanks, astronomy class!
I've even estimated the earth's diameter, and I was only like 30% off (iirc). Pretty good for the simplistic method and rough measurements we used.
Sometimes authorities are actually authoritative, though, particularly for technical, factual material. If I'm reading a published release date for a video game, directly from the publisher -- what is there to contest? Meanwhile, ask an LLM and you may have... mixed results, even if the date is within its knowledge cutoff.
Was it the stick on the earth and measuring the right triangle casted by the shadow?
IIRC you also had to do the same thing on another spot far apart and measure the difference between both triangles. At the same time.
I specifically remember that we measured how far the shadow moved over time using chalk. I think this was in lieu of having a second triangle somewhere else, although, for all I know we might have used a second reference distance.
Our campus had this elaborate outdoor "observatory" that had all sorts of interesting features. The gnomon was one of them, but there were other cool things, like IIRC there was a metal sculpture where Polaris would be seen through a central hole (and a guide inscribed in the concrete to figure out where to stand for that to happen -- I think it was based on viewing height).
For example, if I'm looking for some medical finding and I get to a source that's a clinical study from a reputable publication, I may be satisfied and stop there since this is not my area of expertise. However, a person with knowledge of the field may be able to parse the study and pick it apart better than I could. Hence, their search would not end there since they would be unsatisfied with just the source I was satisfied with.
On the other hand, having no verifiable sources should leave everyone unsatisfied.