It is uncertain but variously ascribed to Pythagoras, Parmenides and Empedocles by their later promoters.
Aristotle concluded that the world is round by realizing that the farther the ship goes the more of it disapears.
Because during a lunar eclipse, Aristotle observed that the shape of the earth was round.
It always casts a curved shadow during a lunar eclipse
Gravity and Inertia.
A boat at sea, alone, does not prove that is earth is round. However, boats can be used to prove that earth is round. This is because if the earth was flat, eventually a boat would sail to the end of earth and fall off the edge. This has never happened, so it can be inferred that the earth is round. Also, a boat can sail all the way around the world and end up right where it started, which proves that the earth is round.
Aristotle concluded that the world is round by realizing that the farther the ship goes the more of it disapears.
Because during a lunar eclipse, Aristotle observed that the shape of the earth was round.
It always casts a curved shadow during a lunar eclipse
Your mom. It was your mom who concluded it.
Any early man that could use common sense would have figured that one out.
That the Earth is round was known to ancient cultures but this knowledge was suppressed in Europe, mainly by the Catholic Church whose dogma insisted that Earth was the centre of the cosmos and lay under Heaven and above Hell. This is surprising since some of the best thinkers in Europe were clerics and monks within the Catholic Church.
umm: "The Earth is round"? ------------------------------------------------ The Earth is not round - it is an oblate spheroid. ---------------------------------------------------------------------------- A (slightly) oblate spheroid seems pretty "round" to me.
Pythagoras stated the earth was round
The moon rotates round the Earth.
the earth is not perfecly round
Hutton and Lyell concluded that Earth is extremely old and that the processes that changed Earth in the past are the same processes that operate in the present.
It is round!