Who was the first to prove that the Earth was a sphere?

It was the Greeks who first proposed that the earth was spherical and gave scientific proof. The theory of the circle of the earth can be traced back to ancient Greece in the sixth century BC. The ancient Greek mathematician Pythagoras first proposed the concept that the earth is a sphere.

Aristotle summed up three scientific methods to prove that the earth is spherical:

The farther north you go, the higher the North Star; The further south you go, the lower the North Star becomes, and you can see some new stars that you won't see in the north.

The long-distance ship first exposed the top of the mast, slowly exposed the hull, and finally the whole ship could be seen.

At the time of the lunar eclipse, the shape of the Earth cast onto the Moon is round.

Since then, most Westerners have recognized the earth as spherical, and Ptolemy's geocentric theory is based on the theory of the circle of the earth. In the Middle Ages, the Roman Church enshrined the geocentric theory as orthodox, which accelerated the spread of the geocentric theory. The circumnavigation of Magellan's fleet during the Age of Discovery and modern satellites** are direct proof of the theory of the circle of the earth.

If the ancients had understood the principle of lunar eclipses, then they would have known that the earth was round.

If you keep walking, you will come back after walking for n years, because the earth is spherical.

Once upon a time there was an old man who looked at the ships on the sea.

The steamer that sailed away first saw the mast when it appeared, and 70 percent of the earth was covered by water.

There are many phenomena in life that can indicate that the earth is a sphere, and the common ones are as follows:

1. The most common one: the sun rises in the east and sets in the west, this phenomenon is enough to prove that the earth is a sphere.

2. When a ship on the sea level comes from afar, it always sees the mast first and then the hull, which can also prove that the earth is a sphere;

3. Standing high and seeing far away can show that the ground plane is an arc, and it can also show that the earth is a sphere;

4. When a partial lunar eclipse occurs, the earth blocks part of the sunlight, so that the shadow of the earth is projected on the surface of the moon, just like looking in a mirror for the earth, so that we can see the shape of the earth's sphere, which can also show that the earth is a sphere.

The reason why the Earth is a sphere is because the Earth is subjected to the gravitational pull of its own mass. The Earth has a gravitational pull that interacts with all objects, and this gravitational pull is caused by the mass of the Earth. The mass of the Earth, although relatively small, is still large enough for its surface to form spheres.

In fact, the Earth is not a complete sphere, but a slightly flattened spheroid. Its diameter varies about 43 kilometers from the equator to the pole, which is due to the rotation of the Earth itself. When the Earth rotates, the radius at the equator is longer than the radius at the poles because the eccentricity at the equator is greater.

This phenomenon is known as the "oblate spherical shape" of the Earth.

In addition to the effect of mass gravity, we can also see the spherical appearance of the Earth. When we see a ship on the coast going away, it seems to disappear above the water level. This is because the surface curvature of the Earth causes this phenomenon.

If the earth is not a sphere, but a plane or other shape, this visual phenomenon will occur without objects or motions.

Another proof that the Earth is a sphere is that when we look at stars and other celestial bodies, we can see their different positions. If the Earth is flat, then all the stars and celestial bodies should appear to be the same size and on the same plane, but in fact we can see that they are in different positions, which is also caused by the fact that the Earth is a sphere.

In summary, the Earth is a sphere or ellipsoid, which is the result of the gravitational pull of its own mass, as well as visual evidence. The shape of this pellet and ellipsoid makes our life and scientific research more convenient and precise. <>

Hello, there are several reasons why the earth is a sphere: first, the rotation of the earth produces a centrifugal force, which causes the equatorial part of the earth to protrude slightly outward from the pole part, thus forming a shape similar to an oblate sphere. This shape is known as "equatorial expansion".

Secondly, the gravitational pull of the earth will cause the earth to reduce the surface energy as much as possible, and the sphere is the shape with the smallest surface energy, so the earth will eventually become a sphere. In addition, we can also prove that the Earth is a sphere by observing its curvature. On the Daqing Sea or on the flat ground, we can see distant objects gradually disappearing below the horizon, because the curvature of the earth makes them gradually disappear from our line of sight.

In short, all of the above factors indicate that the Earth is a sphere, which is also the consensus of scientists on the shape of the Earth.

Summary. Dear, glad to answer for you! Prove that the Earth is a sphere: Ships on the sea level always see the mast first and then the hull when they come from afar, proving that the Earth is spherical.

Dear, glad to answer for you! The reason for proving that the earth is the only big sphere: the ship on the sea level shed always sees the mast first and then the hull chain when it comes from afar, which proves that the earth is spherical.

Extended information: The head of the people talks about renting the time with facts that prove that the earth is a sphere. It's because Magellan set out from where he was, and his round-the-world voyage returned to where he was.

If, as you mentioned, it is a cone, a cylinder, a polyhedron, or something else, then it is very likely that it will deviate from the course on the way.