When sitting on a balcony with a straight balustrade on a hill next to the ocean, it's pretty noticeable the horizon is round, and not a straight like the balustrade is. This must have been noticed in ancient times too
Which part of the horizon of the ocean was lower than another? I'm asking if looking East would be higher than South?
This was looking west, and left part of view was lower than center oart. On right side of the view the ocean was blocked but I expect it to be lower there too (so highest in center of view)