How to measure the distance between the earth and the sun

Halley, a famous astronomer, first realized that the distance between the sun and the earth can be measured by using the transit of Venus, so as to determine the size of the solar system by using Kepler's law of planetary motion

How is the distance between the sun and the earth measured?

Triangulation (also known as parallax method). The earth orbits around the sun with a diameter of about 300 million kilometers. Astronomers can observe a star one day, and then observe the same star half a year later. They can find the difference in the angle of view between the two stars

What are the ways to measure the distance between the earth and the sun

The simplest method is the speed of light method, but it needs to calculate the sunrise time of a certain day, from this time to stop when you see the sun, and then multiply the speed of light by the time difference to get it

What is the nearest celestial body to the earth（
It depends on the definition of celestial body
Generally speaking, it's the moon
If satellites don't count, it's Venus
If planets don't count, it's the sun
If not in the solar system, it is an invisible companion of the neighboring star
If man-made celestial bodies are also included, they are, of course, man-made satellites
If it's OK at any special time, it's the comet at the moment when it hits the earth

It depends on the definition of celestial body
Generally speaking, it's the moon
If satellites don't count, it's Venus
If planets don't count, it's the sun
If not in the solar system, it is an invisible companion of the neighboring star
If man-made celestial bodies are also included, they are, of course, man-made satellites
If you can do it at any special time (not at ordinary times), it's the comet at the moment when the comet hit the earth

The nearest natural celestial body to the earth is ()
A. Sun B. moon C. Venus D. neighboring star

A. The sun is the nearest star to the earth, but it is not the nearest celestial body to the earth, so it is not in line with the meaning; B. the moon is the nearest satellite to the earth, and it is the nearest celestial body to the earth, so it is correct; C. Venus is the nearest planet to the earth, but it is not the nearest celestial body to the earth, so it is not in line with the meaning; D. the neighboring star is not the nearest celestial body to the earth, so it is not in line with the meaning It is not in accordance with the meaning of the question

How can a planet 600 light-years from earth be detected?
The new earth is 600 light-years away from the earth (about 9.46 trillion kilometers per year) outside the solar system. It is 2.4 times the size of the earth. It orbits a sun like star for one cycle. It may have water and is suitable for living creatures, just like the twins of the earth
There is a problem that has been puzzling me all the time. How did human beings find the place where the speed of light can only be reached 600 years ago? Was it launched 600 years ago? There was no such technology 600 years ago. How did they find it?

It wasn't launched 600 years ago, but 600 years ago, light came from the "new earth". After 600 years (that is to say, up to now), light came to our earth, so we see it now,
Similarly, it emits light all the time, so we can see it all the time, but no matter when we see it, we will see the "new earth" 600 years before that time

If we look at a planet 10 billion light-years away from the earth, what we see is what happened to the planet 10 billion years ago. Is that correct?

So, the general direction is correct, but the specific direction is not very accurate. First of all, you can think of this problem very well. Praise the spirit of independent thinking. For example, the sun is 150 million kilometers away from us, and light takes eight minutes to fly around. That is to say, if the sun suddenly "goes out" (of course not

How do scientists know that a planet is 10 billion light-years away from the earth?

Hubble's law equation
(V=Hr)
Hubble, the most important astronomer in modern times, observed all kinds of galaxies and found that the farther away the galaxies are from us, the faster they are away from us. This is the famous Hubble law
Hubble has made three great contributions to astronomy in his life: first, he has confirmed that many small and dark nebulae are actually "other" galaxies, expanding our universe hundreds of millions of times; second, he has classified nebulae, which is still widely used today; third, he has discovered Hubble's law
Many people think that Hubble is the first person to discover the expansion of the universe and the high-speed departure of "nebula". In fact, Shriver, who was earlier in the same period with Hubble, has observed from the spectrum that many "nebulae" leave us at different speeds. However, Shriver has not found out the relationship between the speed of "nebula" and its distance, and quantified it. Hubble has achieved this
The equation of Hubble's law is v = HR, V is the speed of the planet's outward flight, R is the distance between the planet and the earth, and H is the Hubble constant
According to this theorem, we can calculate how long the universe has expanded. "Because the light wave strength of a star is directly related to its distance from the earth, scientists can calculate the distance from the planet to the earth, so as to know the number of Hubble constant and further calculate the age of the universe."
The Hubble constant can also be called the expansion coefficient of the universe. Recently, the researchers of the Hubble telescope determined the distance of galaxies through the Cepheid variable stars in distant galaxies, and calculated that the Hubble constant is about 70 km / sec / MPC per million second distance, with an error of 10%, which can be converted into the age of the universe of 12 billion years

How is the planet tens of thousands of light-years away from the earth calculated?
Tens of thousands of light-years, how do scientists calculate when light travels for tens of thousands of years?

Red shift of spectral line caused by Doppler effect
Or observe the light period of Cepheids in distant galaxies

Which country's astronomers have observed a quasar 20 billion light-years away from the earth?

In the early 1980s, Australian astronomers observed a quasar 20 billion light-years away from the earth

How to measure the distance between the earth and the sun