Over a few years, our family had several weeks of holidays in a "house" 50 metres from a rocky shore. I was about 10. No electricity.
A luxury was water that ran from a tap. Sometimes we had to clear a blockage at the intake pipe, about 30 metres up a steep stream behind the house. After sorting this one morning, I sat down and looked out to sea. Surprise! From a few metres up a hill, the horizon was above a particular rock, yet from the water’s edge, the top of that rock was above the horizon.
Another time, at the water's edge there was a ship at the horizon with a blue hull. Yet climb just a couple of metres and the ship had a red stripe along the water line.
Meaning?
IF THE HORIZON shifts away from you when you climb even a couple of metres, THEN THE SURFACE of the water between you and the horizon is curved. THE EARTH is ROUND!
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