as the sun sets over a still ocean it creates a perfectly straight line reflection as far as the eye can see ! if there is a curve that line wudnt be straight . the boat on the horizion that disappears is because of atmosphere density and the eye can no longer see it , not because its gone over the curve . if the earth is spining why can oceans be abosolute ripple free and calm if no wind ! ( ie moving a container of water )if we are moving why can we see the same star patterns in the night sky ? why can we sometime see the sun and moon same time ? why doesnt water fall off the bottom of the earths axis if round ? why does a plane not calculate earths curvature into its flight ( u shud feel the gradual dip in the nose when in flight ) so many reasonable questions , and the one thing we do no we have been lied to bad on so many other things