A Copernican eye-opener
Approximately 500 years ago a Polish lawyer, medical doctor, and churchman got a radical idea: that the earth was not fixed solidly in the middle of all space, but was spinning at a thousand miles per hour at its equator and was speeding around the sun at a dizzying rate. Unbelievable, critics said. If that were true, at the equator people would be spun off into space. And it would be much harder to walk west than east.