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Why do I know that the sun doesn't move in the sky but the earth does-- it tilts 23 miles in 24 hour period (depending on where you are on the earth) and it take 12.345 minutes for lit to reach us from the outer edge of the sun. ( I used to work in a solar observatory)
WHy do I know I am not-- I just worked with smart people :-) O once new a guy who made an antenna out of a pop can for an airplane from looking at the drawings of the plane- he measured it-built it and said install it-- they did and every bolt hole lined up and the antenna worked perfectly. The military the copied it to use during the first gulf war... but he could get a joke no matter how easy it was :-)
Why is Chad so correct? If I had said the earth tilts about 30 miles every day to the North, no one would know what the hell I was trying to say but Chad.