as I think...besides the mass of the planet no matter where you are.
The self-rotation will make the same force just like the gravity.
Image that you are in the universe, and there is a out-space station...how to keep human walk in it? well, self-rotation can solve the problem
p.s I'm not from a country that English is my mother language, and this is my
first time try to post something on...so, if you can't understand waht am
I talking about, I'm so sorry and I will improve it. Thanks for your
understanding.
