How to calculate the distance between the earth and the sun?

How to calculate the distance between the earth and the sun?

After reading your question on the first floor, I would like to say that the person who asked your question is more clear than the person who answered it on the first floor. You are quite right - trigonometric parallax ranging is a very basic method for celestial body ranging. The sun is no exception. The first method is to measure the equatorial parallax of the sun, and then use three

How far is the earth from the sun
How far is the earth from the sun

The earth's orbit around the sun is an ellipse which is close to a circle. The sun is located at a focal point of the ellipse, so the distance between the sun and the earth is constantly changing in a year or even in a day

How to calculate the distance between the earth and the sun?

Laser ranging measures the time difference between two laser beams returning to the earth's surface

Who measured the speed of light and how?

In 1849, the Frenchman fisso first designed an experimental device on the ground to measure the speed of light. His method is similar to Galileo's

Is it faster than light?
The velocity of free falling body is 1 / 2GT square, if the time is long enough, will it exceed the speed of light
Which expert answers why!
In an ideal state

Fengly has given many examples. Now I'll explain your question and see if you can accept it
First of all, you must know the scope of application of early classical physics, which is not applicable to high-speed motion or micro particles
There are some important theories in modern physics, such as general relativity and quantum theory. If you really want to study physics deeply, you'd better read these works first
The problem begins
1 / 2GT square. In free falling motion, the acceleration of gravity changes all the time. The closer to the center of the earth, the greater the acceleration. If you think of it as a fixed acceleration, you can. But before you reach high-speed motion, you must specify two observers, one on the flying object and the other on the earth
When the speed of an object is close to the speed of light, according to Einstein's space expansion and time expansion formula (too complex, with a root sign), it is known that the gravity field around the object tends to infinity, which is affected by the gravity field. At this time, for the observer on the earth, the movement of the object is very fast, but it takes a certain time T1 to reach point a, But it's different for the observer on the object. For him, due to the huge gravity field around him, his time (for people on the earth) slows down, so he only needs T2 (T1 is much greater than > T2)
Now suppose that he exceeds the speed of light, then according to the above deduction, we can get the paradox that this person will arrive at point a before reaching point a, so it is impossible to accelerate to the speed of light
I write very hard. I need to give more marks

Calculation of the speed of light
It takes 500s for the light from the sun to reach the earth. What is the distance between the sun and the earth?

500*3*10^8=1.5*10^11

Beyond the speed of light
Does light represent time

The mass becomes imaginary, the gravitational effect becomes repulsive, just like dark energy. But it can never exceed the speed of light. When it reaches the speed of light, time will flow backwards, that is to say, the speed will be negative. If it subtracts from the speed of light, it will certainly be lower than the speed of light. But it is possible to reach the future. When it approaches the speed of light, time will slow down

Electrons go faster than light?
For example, if there is a long enough charged conductor with enough electrons and a long enough uncharged conductor is used to touch one end of the conductor in a very short time, the electrons should be evenly distributed in the two conductors at this moment. During this period, will the speed of electrons exceed the speed of light?
If the length L is infinitely long and the time t is infinitely small, can it be realized

In the world of relativity, there is no concept of instant. Even time has to explain the reference frame. Instant is just human's intuitive feeling. In relativity, there is a speed limit for material transfer or energy transfer. This is the speed of light, so what you say can't be realized

Can it reach the speed of light?
Make a clock in the vacuum environment of space, make the pointer very long, and then use a small angular velocity to make it rotate. Can the speed of light be reached at the tip of the pointer?
Suppose the angular velocity is 10rad / s and the radius is 30000m. Is that ok?
The speed of light is not infinite

First of all, the speed of light is out of reach!
Secondly, the theory you said is feasible, but you have to consider the problem of materials. No materials can meet the requirements! The problem you said was mentioned many years ago
The rigidity of the material can't meet the requirements. Ideally, it can

If I reach the speed of light
If I can reach the speed of light, why won't I get old? First of all, what's the relationship between human aging and the speed of movement? This doesn't make sense. According to the theory, we can see the past space-time scene by exceeding the speed of light. This is easy to understand, but why can't aging have anything to do with reaching the speed of light. Please give us a detailed answer

1. According to Einstein's theory of relativity, objects can't reach the speed of light, they can only approach the speed of light infinitely. If you take a spaceship to run at the speed of light infinitely, the time in the spaceship will be very slow. The closer you get to the speed of light, the slower it will be. Why is this? Suppose the spaceship you are sitting in is very, very