How to use the shadow of a tree to prove that the Earth is a sphere

The sun is above us, and at night we can't see the sun, that is, we run to the bottom of the stars under our feet, and the moon runs to the stars under our feet, and the stars under our feet are blocked between the moon and the sun, and the shadows of the stars under our feet will fall on the moon.

It's too difficult to prove that the Earth is a sphere purely from a tree, so I'll abstract your question: how to prove that the Earth is a sphere with a benchmark perpendicular to the ground.

1.Select a reference. This benchmark can be straight and long (......The tree can't meet this requirement, the Burj Khalifa is almost fine, and it can't use the economic and trade building in Shanghai.

2.Measurement. The first is to measure the height of the benchmark, the second is the angle between the projection of the shadow cast by the sun and the projection point of the shadow at the top of the benchmark and the line connecting the low end of the benchmark, and the third is to measure the actual distance between the projection point of the shadow at the top of the benchmark and the low end of the benchmark.

3.Compute. OK, the length and angle are known, use the trigonometric function to calculate the theoretical distance between the projection point of the shadow at the top of the benchmark and the low end of the benchmark, and after the calculation, you will find that the actual distance is longer than the theoretical distance, why?

Because the earth's surface is curved, the distance on the curved surface is longer than the straight line distance.

4.Repeat. Of course, you can't experiment only once, the surface of the earth is already uneven, and you can't prove that the earth is a sphere at all.

So, students, take the Burj Khalifa on your back, travel around the world, repeat thousands of experiments in different latitudes and longitudes and the direction of sunlight, and calculate the average value after measurement and calculation, and finally you can prove that in any direction, the surface of the earth is an arc with fixed curvature, that is, the earth is a sphere. As long as your data is accurate, I believe you can calculate the curvature of the earth.

Congratulations. Well, that's it.

Columbus circumnavigated the globe; The sun rises in the east and sets in the west; The sea overlooks the sea in the shape of a dome, or the ship first exposes the high place, and gradually sees the hull; Satellite**, etc.

Examples that can prove the shape of the earth, such as: climbing high and looking into the distance, seeing a sailboat coming from a distance on the seashore, always seeing the mast first, then the hull, the lunar eclipse, the earth's satellite**, etc. Options a, c, and d are not in line with the topic

Therefore, b

There is no evidence that the Earth is a sphere.

1.The horizon is arc-shaped;

Rebuttal, which eye did you see that the horizon was arcing? Our sea level, even cloud level, all horizons are straight. In addition to the official, the horizon shot with a fisheye lens is curved, and all folk enthusiasts shoot ** flat.

2.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;

In counter, the disappearance of the view of ships at sea level starts from the mast, and it is impossible to prove that the earth is a sphere, because it is related to the limitation of the human eye's vision.

3.During a solar eclipse or lunar eclipse, observing the moon, the solar eclipse always has a certain arc. prove that the earth is round;

To retort, the fact that the solar eclipse always has a certain arc just proves that the moon is not a sphere, but flat, because if the moon is a sphere, then the shadow should be an S shape! In addition, there is already too much evidence in ancient times to see the moon hanging high on one side at the same time as a solar eclipse occurs.

4.Magellan's circumnavigation of the world;

Rebuttal: On the horizon model, the circumnavigation of the globe in the east-west direction also holds.

5.During a partial lunar eclipse, the Earth blocks a portion of the daylight, causing the Earth's shadow to be cast on the surface of the Moon, just like looking in a mirror to the Earth, allowing us to see the shape of the Earth's sphere.

Rebuttal: The true principle of a lunar eclipse is never occlusion!

6.The moon landing was seen as a sphere, and NASA and Google announced that it was a sphere.

Rebuttal: they, like scientists, are the mouthpieces of the world elite. Therefore, the official conclusions are not credible.

1, in any part of the earth to go in one direction The final is to return to the original point, Magellan's circumnavigation of the world is an example 2 Ships traveling far away at sea level always see the mast first and then see the hull 3 The crescent moon is the projection of the earth on the moon is arc-shaped 4 Ascend and look far If the earth is flat, you don't need to climb high and look far away Just look far 5 The earth on the ** photographed by the satellite is spherical.

1. Ports.

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 first below the horizon, and then the mast.

When the ships returned from the sea, the order was reversed: first the mast, then the hull, rising from the horizon. There have been articles criticizing this simple method as unscientific, and the quibble is because of the illusion of perspective. However, if you don't believe it, bring a telescope to see.

2. Look up at the starry sky.

This was discovered by the Greek philosopher Aristotle in 350 BC. Different constellations can be seen at different latitudes on Earth. Probably the most striking example is the Big Dipper.

The Big Dipper, a set of seven stars that looks like a ladle and can be seen at latitudes of 41 degrees north latitude or higher.

And in the south, below 25 degrees latitude, you can't see it at all. And in northern Australia, in the northern latitudes, the Big Dipper on the North Cape is only barely distributed on the horizon, just being seen. Meanwhile, in the Southern Hemisphere, there is the Southern Cross, a bright four-star constellation.

This sign won't be discovered until you reach the Southern Hemisphere.

3. Observe the lunar eclipse.

Aristotle also supported his view that during a lunar eclipse, the Earth's shadow on the surface of the Sun is curved. Since this curved shape is present in all eclipses, although Aristotle correctly intuitively knew from this curved shadow that the earth is curved, in other words, a sphere.

On this issue, solar eclipses also tend to support the idea that the Earth, Moon, and Sun are a bunch of circular objects revolving around each other. If the Earth is a disk, and the stars and planets are a bunch of small ones, if it's just nearby objects hovering over a dome above the surface, as many flat people believe, then the total solar eclipse that crossed North America in August 2017 becomes difficult to explain.

4. "Go up the tree".

Here's another self-explanatory piece of evidence: if you go higher, you can see farther. If the Earth is flat, you can see the same distance no matter what your altitude is.

Think about it, your eyes can detect a bright object, like the Andromeda Galaxy, despite being 2.6 million light-years away from Earth.

So in one city, you should be able to see the lights of another city. But the truth is, it's hard to see, with or without a telescope. This is because the curvature of the earth limits our vision to less than 5 kilometers, unless you climb a big tree, or climb a mountain and look down from a high place.

5. Weather balloons.

In January 2017, students at the University of Leicester strapped some cameras to a weather balloon and sent it into the sky. The balloon rose 77,429 feet (km), well above the level needed to observe the Earth's curves. The instruments on board the balloon sent back shocking footage, showing the curve of the horizon.

As long as your balloon has a payload of less than ten pounds, there are almost no restrictions on launching it.

We all know that the Earth is a sphere, so how do we know it's a sphere? How do we prove that the earth beneath our feet is a spherical celestial body?

1. Magellan's circumnavigation of the world.

2. Satellite**.

3. During a lunar eclipse, the shadow part is arc-shaped.

3. Satellite**.

4. When watching the voyage in the open sea, it is the hull of the ship that disappears first, and the sail that disappears later.

Satellite astronomical telescopes can see that the Earth is a sphere.

The earth is a huge sphere, people's understanding of the earth has gone through a long and difficult process of exploration, life can prove that the earth is spherical phenomenon has sailing ships coming from a distance, first see the mast, then see the hull; Magellan's circumnavigation of the world; Climb high and look far away, and people really see the whole picture of the earth from the satellite **, so the most powerful evidence to prove that the earth is a sphere is the earth taken from the satellite**

So the answer is: Magellan circumnavigated the globe, climbed high and looked far away, and photographed the Earth on satellites**

Evidence that the Earth is a sphere includes:

From the seashore you see a sailboat approaching from a distance, first you see the mast, then you see the hull. From the seaside, I saw the sailboat sailing into the distance, and the hull disappeared first, and the mast disappeared later.

Magellan's successful circumnavigation of the globe proved for the first time that the Earth was a sphere.

Climb high and look far, if you want to see far, you want to climb higher.

The Earth's shadow is circular during a lunar eclipse.

Sputnik photographed Earth**.

When Foucault pendulums in a lunar eclipse, the Earth's shadow is round.

Magellan's circumnavigation of the world.

Sailing ships returning from afar at sea always see the mast first.

Magellan's voyages proved that the Earth is a sphere.

The Earth is a sphere as seen from the sky and from the universe.

The moon in the sky is sometimes round, and it can be said that the earth is a sphere.

1. There is a sailboat coming in the distance, and you will see the top of the mast first 2. Magellan's circumnavigation of the world 3Day and night alternate.

1. Sailboats returning from afar at sea always see the mast first.

2. In different locations, the time to see the sunrise is different.

3. The Earth is seen in space as a blue sphere.