Carl Sagan explains one of the methods the Greeks used to show the world is round. Done with 3 sticks, the result falsifies flat earth as a possible solution. When Eristhostenes did this, he was measuring the size of the earth, they already knew it was ro

Carl Sagan explains one of the methods the Greeks used to show the world is round. Done with 3 sticks, the result falsifies flat earth as a possible solution. When Eristhostenes did this, he was measuring the size of the earth, they already knew it was ro