Is the Earth round? What is the strong evidence?

Introduction: Humans have known that the earth is round for thousands of years. But few people can see with their own eyes that the earth is round. In fact, we can also prove that the earth is round by observing life.

In the Northern Hemisphere, the sun rises in the east and sets in the west every day, peaking in the southern sky. If we plot the trajectory of the sun in the sky for each day of the year, we will find that the trajectory line of the sun is lowest on the winter solstice, and the daylight hours are very short. On the summer solstice, the sun's trajectory line is the highest, basically overhead.

If we take a camera picture of the sun's path across the sky during the year, we will see a series of beautiful arcs, with the highest and longest arcs forming on the summer solstice and the lowest and shortest arcs on the winter solstice. Today, we can still prove that the Earth is a sphere in the same way and measure the circumference of the Earth by hand.

Another way to prove that the Earth is spherical is to go to the harbor and observe. When a ship sails towards the horizon, it doesn't get smaller and smaller until it's no longer visible. On the contrary, the hull seems to sink below the horizon first, and only then the mast.

When the ship returns from the sea, the order is reversed: first, the mast rises from the horizon, then the hull. This shows that the horizon is not "flat", and that there is a certain arc at one end and at that end.

Moreover, if we look at different places, we will find that when the ship returns to Hong Kong, the distance from its outcropping on the surface of the sea to its full appearance is about the same, which indicates that the curvature of the ground is basically the same in different places, and the only thing that has this property is spherical.

In addition to the methods mentioned above, we can also identify that the Earth is round by different latitudes, different stars, the alternation of day and night of the Earth, and the setting of time zones, and even compare the shape of the Earth with the shape of other celestial bodies in its sky. After all, Earth is just a planet and is unlikely to be "special". Thus, the earth is round.

The Earth is elliptical. The more favorable evidence is that observations can be made by satellites, which can be extrapolated by measuring the Earth, measuring the volume and size of the Earth by satellites, measuring the geology of the Earth, and measuring the width and height of the Earth.

Yes, through the observations of some satellites, it can be determined that the Earth is indeed a circle, which can be determined by some **, by some calculations.

The earth is not round, to be precise, it is an oval, and the ** photographed in space can prove that the earth is not round.

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. Sea level.

The ships that come from afar, always see 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.

Here are a few events that can prove that the Earth is round:

1. At sea, when a distant ship comes towards us, we will first see the mast of the sail.

2. In places not on the equator, whirlpools will form when the water in the container leaks out of the small hole.

3. Where it is not on the equator, hang a pendulum and let it swing in the east-west direction, and it will slowly form a conical pendulum, that is, the pendulum of the pendulum will be rounded.

4. Magellan sailed in one direction and finally arrived at the departure point.

5. During solar and lunar eclipses, the Earth's shadow cast on the Sun and Moon is always arc-shaped.

The first to propose that the earth is round:

The ancient Greek mathematician Pythagoras, who lived in the 6th century BC, believed that the earth was spherical from the point of view that the sphere was the most perfect geometry. In addition, Pythagoras also formulated the mathematical rules for the circular motion of celestial bodies, and proposed the idea that the sun, moon and planets should move in a circular motion. The Earth revolves along a spherical surface around a "fire" at a fixed point in space, and on the other side there is a "Earth Star" balanced with it.

This kind of thinking had an important influence on Copernicus's "heliocentrism" theory in later generations. Pythagoras put forward the idea that the earth is spherical in the 6th century B.C., and put forward the corresponding conjectures and reasoning, which is undoubtedly unprecedented. But Pythagoras only made this argument and did not give a strong basis for everyone to accept it, and the process was actually very long.

After Pythagoras, Plato, a master of deductive reasoning, further refined the idea of the great earth shape, he believed that the form of symmetry is one of the properties of perfection, and the place where human beings live should also be symmetrical, symmetrical up and down, symmetrical left and right, all kinds of symmetry, can only be spherical.

The real scientific proof of the "spherical big talk" was Aristotle, the most learned man of ancient Greece, who proved it through many of his own observations and discoveries. For example, the further north you go, the higher you will see the North Star above the ground, and the further south you go, the lower you will see the lowest Polaris above the ground, which would not be the case if the ground was flat.

After that, many scholars in ancient Greece made various data measurements of the earth on the basis of Aristotle, and Ptolemy's "Guide to Geography" shocked the world.