There is an easy explanation here. It is very apparent to any from the outside that read through this thread that not all science is accepted by flat earth people. If you want to choose which parts of science to believe and which parts to dismiss as lies, don't try to argue science. Choosing to argue half science against full science is the same as insisting spherical trigonometry is required to be used to measure something that is not a sphere. Too much third grade science being used to prove any point to anyone that paid attention past grammar school.