Okay, when looking at a horizon on a sphere, the horizon is ALWAYS TANGENT to the observer! - Of course there is no curve. You are looking at a piece of land/water parallel too it's surface! - You are always looking down at it, because the curved surface drops. This is proved by survey measurements! ----------- This nonsense of I can tell by eye and it's at eye level is crap. Are you an instrument that can measure to an accuracy of 5 arc seconds? (5/3600th of a degree) No. How do you know something is level, just by looking at it? ( We're talking 3 degrees or less here!) ------------ FE'ers, give me some concrete numbers and measurements please! - The horizon is always TANGENT to the observer (so it may look flat, because it is parallel to your viewpoint) - The horizon always drops from the horizontal (measured by surveyors) - None of our balloons, rockets etc are at a significantly high enough level to see curvature