North Star and Big Dipper What do they mean? As the title suggests, thank you

Before observing the Big Dipper, you need to determine the latitude of the place where you are observing. Because the horizon height of the North Star is equal to the geographic latitude of the observer. After determining the latitude, when the sunny night falls, you face due north, your eyes are horizontal, your head is raised, and the angle is the degree of the latitude you just determined (if you are at 45 degrees north latitude, then you will raise 45 degrees, how to measure this angle, hehe, simply find a protractor to make it).

At this time, there should be a star in the center of your field of vision that is brighter than the surrounding stars, this star is called Ursa Minor, and the traditional name in our country is "Gou Chen Er". It is also commonly known as the North Star (the North Pole of the sky is the direction of the Earth's axis, in fact, this star is not the location of the real North Pole of the sky, but it is currently the bright star closest to the North Pole of the sky. Due to the "precession", after 12,000 years, Vega will become the North Star).

Polaris never sets, and you can see it during the day if there is a total solar eclipse. Another thing to understand is that in the Northern Hemisphere, when you look at the starry sky, all the stars revolve around the North Star (think for yourself why?). This is also why the North Pole is located first when using astronomical telescopes.

Let's talk about the Big Dipper. The Big Dipper consists of seven stars and is part of the constellation Ursa Major in modern astronomy. In fact, these seven stars are relatively easy to recognize in the northern sky, the four stars of the bucket spoon are close to the direction of the North Pole, and the bucket handle is three stars outside.

Most people find the Big Dipper first and then the North Star when they don't have tools. As mentioned earlier, the Northern Hemisphere star rotates clockwise around the celestial north pole, so when you observe the Big Dipper at different times, its position will be different. There is an old Chinese saying that can be remembered:

The bucket handle refers to the east, and the world is spring; The bucket handle refers to the south, and the world is summer; The bucket handle refers to the west, and the world is autumn; The north finger of the bucket handle, the world is winter. In other words, at dusk in the spring night, you can see the handle pointing east, and so on. At this point, you can find the spoon in the direction of the handle.

If you're at a high enough latitude, you'll be able to see it all night long (although there may be a time when the Big Dipper is above you). Polaris] is the name of the constellation, which is the symbol of the northern sky. Ancient astronomers revered the North Star, believing it to be fixed and all the stars revolving around it.

In fact, due to precession, the North Star is also changing. Three thousand years ago, the Zhou Dynasty took the Emperor Star as the North Star, the Sui, Tang, Song, Yuan, and Ming Dynasty took Tianshu as the North Star, and 12,000 years later, Vega will become the North Star.

The Big Dipper means fate The North Star means positive and clear.

They are all stars, and they are celestial bodies that can emit light by nuclear fusion, and the Big Dipper has been revolving around the North Star, and the position of the Big Dipper can also be determined by the position of the North Star.

1. The number is different Polaris is the name of a star; The Big Dipper is composed of seven stars, named because the shape of the composition resembles a bucket, also known as the "Big Dipper".

2. The role of the North Star is to point out the direction of due north very accurately; And the role of the Big Dipper is to help find the North Star. Polaris is an extension of the two stars connected below it, so it's easy to find.

3. Different locations The Big Dipper is part of the constellation Ursa Major, and graphically, the Big Dipper is located at the tail of the Ursa Major; Six of the seven stars are of the 2nd magnitude and 1 is of the 3rd magnitude, and the North Star is found by connecting the two stars of the Doukou and extending about 5 times in the direction of the Doukou.

The North Star and the Big Dipper.

There is a clear relationship in location, and the North Star can be found by looking for the Big Dipper first and then through the Big Dipper. The Big Dipper is part of the constellation Ursa Major, and graphically, the Big Dipper is located on the back and tail of the Ursa Major. Six of these seven stars are of 2nd magnitude and one is of 3rd magnitude.

Through the two stars of the mouth of the bucket (Tianshu.

Tianxuan) line, extending about 5 times in the direction of Doukou, found the North Star. Beginners can look for other constellations from the Big Dipper.

The relationship between the North Star and the Big Dipper is that the Big Dipper rotates counterclockwise with the North Star as the center.

Polaris is positioned very close to the extension of the Earth's axis of rotation, so no matter how the Earth rotates, Polaris will not rotate, but will move slowly near the North Celestial Pole. The Big Dipper is farther away from the North Celestial Pole, and as the Earth rotates, we will see the Big Dipper rotating around Polaris in a counterclockwise direction on Earth, because the Earth's rotation is counterclockwise when viewed from the North Celestial direction.

Because the earth is rotating around an imaginary axis, called the earth's axis, the North Star is on the extension of the Earth's axis, and when the earth rotates, it always points to the North Star, so the North Star is always in the north.

Rotation is the rotation of itself around an axis through the center of the earth and the north and south poles (the north and south poles are thus defined), which is also the cause of the daylight and the rotation of the stars. And Polaris is just on the extension of the North Pole of this axis, so no matter how the Earth turns, it is due north. Some friends may be asking again, isn't the earth still revolving, and isn't the position deviating?

To answer this question, we must first have a concept of distance. The Earth is more than 400 light-years away from Polaris and only 8 light-minutes (about 150 million kilometers) from the Sun. Polaris, like the Sun, is a star and its position is relatively constant, while the Earth's orbit is around the Sun, and the diameter of its orbit is only about 16 light minutes.

And the proportion of 16 minutes is basically negligible compared to more than 400 years.

To sum up, Polaris is always due north of the Earth, and everyone should be able to understand it.

The North Star is immobile, and people look at the North Star from the Earth, and the North Star points to the north, no matter how the Earth rotates, as long as the North Star does not move, it points to the north, just like when the sun is above you, no matter how you move, the sun is there, and there is no rotation involved here because the sun is not pointing.

Polaris has always had a beautiful woman in the north to do it, you just think,

The North Star hangs forever high in the north, and the Earth is turning.

Give Uncle him ** Du U, and then he replied that it was okay today.

Polaris: Polaris is a bright star in the northern part of the sky (emphasizing a star different from the Big Dipper), located at the tip of the tail of the bear in the constellation Ursa Minor, very close to the North Celestial Pole, almost facing the Earth's axis, and its position is almost unchanged from the Earth's northern hemisphere.

The Big Dipper, which we often call the Big Dipper for direction, is made up of seven stars, and it is located in the constellation Ursa Major.

The two can be distinguished with an intuitive diagram.

Many people can't tell the difference between the Big Dipper, which is part of the constellation Ursa Major and is commonly known as the Big Dipper, which is a familiar spoon-shaped star of seven stars.

The North Star is used to identify the north, the North Star is in the constellation Ursa Minor, not far from the Big Dipper, the following picture is a schematic diagram of how to use the Big Dipper to find the North Star:

The Big Dipper, is seven stars; The North Star is one.