How to prove that the earth is a sphere don t do it in the book .

1.2 is noticeable when you're flying. When the balloon is blown up, the balloon is round, because of the effect of atmospheric pressure, and the atmosphere is distributed according to the spherical surface, which indirectly proves that the earth is round.

3,。The fruits are all round, have you ever seen a square fruit? Even if there is, that's the exception.

You keep walking along one place and end up back where you are. Or you can take a look at the aerial photos of the Earth taken back by the astronauts.

Keep walking in one direction, and going around the earth will return to the starting point.

The ship on the horizon first appeared as a dot and gradually grew larger Archimedes' approach.

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 simplest example is the example of navigation: the earth is not flat, but has an arc.

In the 3rd century B.C., the Alexander scholar Eratosthenes pioneered the radian measurement method of the meridian circle, which actually measured the latitude difference to estimate the radius of the earth's circle, and was the first to confirm the "theory of the circle of the earth".Later, Zhang Heng, an astronomer in the Eastern Han Dynasty of China, made a complete exposition of the "armillary theory" in the "Armillary Sphere Annotation", and also realized that the earth is a sphere. However, in his astronomical work "Lingxian", it is said that the sky is round and the earth is flat.

All this shows that people's understanding of the shape of the earth at that time was still very unclear.

From the 6th century onwards, the West was under the shackles of religion, and instead of continuing to follow the path of understanding the material world, people regressed. On the contrary, China's science and technology were developing rapidly. In the 20s of the 8th century AD, the Tang Dynasty monks and his party sent the Taishi Supervisor Nangong to say that the radian measurement was carried out in the Henan Plain, and its distance and latitude difference were measured on the spot, which was the first time in the world.

From this, it is concluded that the 1-degree arc of the Earth's meridian is 21 kilometers larger than the modern exact value. Later, the 9th century was followed by fruitful arc measurements in Arabia. This confirms that the earth is spherical.

However, due to the limited range of human activity at that time, its true shape has not been tested in practice. It was not until 1522, more than 400 years ago, when the navigator Magellan led a fleet from Spain to the west, passing through the Atlantic, Pacific and Indian Oceans, and finally back to Spain, that it was proved that the Earth was indeed a sphere.

The earth is an irregular sphere with slightly flattened poles and slightly bulging at the equator; The evidence that proves that the Earth is a sphere is that it stands tall and burns far away, that the satellite takes a picture of the Earth and that the Earth is observed on a spacecraft, that the hull of the ship on the shore always disappears first, and the mast disappears later, and that Magellan sails around the world at a high speed.