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[–] kry0 1 point 0 points (+1|-1) ago  (edited ago)

Trigonometry is a branch of pure math that stands independent of any physical laws. Regardless of any constants used in trigonometry, cosine and sine still follow Euler's Formula, and Euler's number is still the single number whose natural logarithm equals one.

Using pure geometry and a car, you can easily disprove the flat earth model, especially if you live in the southern hemisphere. The flat earth model, when calculating the distance from one side of australia to the other, is 2 times the correct value - a value calculated perfectly on a globe and the value that would appear on your odometer if you were to drive the distance. The curious thing is that no matter where you go on earth with your car, there will always be a different discrepancy at different latitudes in the distance between reality and flat earth model, but it will mesh with the globe model (reality) every time. This guy explains it perfectly.

So, to answer your question, we know that physics works correctly at different scales by observing them around the globe that we have proven to be round using nothing but pure, universal mathematics.

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[–] varialus ago  (edited ago)

Totally missing the point. I know you can't actually prove a flat earth, but a certain portion of of physical laws can be stretched to make it appear like the earth is flat, which is fun in its own right. A flat earth with spatial distortions that make physical laws seem like it's spherical even though it's actually flat would account for your proof. The earth is flat, it's just all of space and time that is warped all around it to make it appear spherical.

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[–] kry0 ago 

If you can find a model that distort physical laws to make spherical trigonometry map 1 to 1 to polar trigonometry, then you'd probably win some sort of international mathematics prize.

Until then, perhaps claiming that "physical laws can be stretched to make it appear like the earth is flat" is fun, but absolutely not evidence of a flat earth.