Quote Originally Posted by woodman View Post
I don't know if this has been discussed yet:

Another logical refutation of the flat earth theory is the coriolis effect;
https://www.scienceabc.com/nature/hu...is-effect.html

It is interesting that because the circumference of the earth is smaller toward the polar regions, this means the speed of rotation is markedly different from pole to equator.

I have read that water tends to swirl clockwise south of the equator and counter clockwise north of the equator. I did visit Peru last year but I was too busy to check out the toilets behavior.

We know it rotates, because we observe it by looking at the planetary objects.

BUT does it rotate, if you ignore the external (has nothing/little to do with the earth) objects.

Does a car driving down your street make your chair spin?

When you confine your observation point to it alone, the earth is not moving.