What does celestial body mean, what does astronomy mean

Do you know what celestial bodies are?

Astronomy means the distribution and movement of celestial bodies such as the sun, moon, and stars in the universe, such as geography.

1. Basic explanation.

Astronomy is a Chinese word, pinyin is tiān wén, which was first seen in China's ancient work "Book of Changes" - rigid and soft intertwined, astronomy also. Civilization ends, and so does humanity. "Interpret the phenomena of the condensation, distribution, and movement of celestial bodies in the universe.

2. Detailed explanation.

1. Phenomena such as the distribution and operation of celestial bodies such as the sun, moon and stars in the universe. The ancients also included earthly phenomena such as wind, clouds, rain, dew, frost, and snow in the scope of astronomy.

2. Astronomy. Chen Kangqi of the Qing Dynasty "Lang Qian Chronicles" Volume 1: "Hiring Westerners as professors, all the bright children of the Chinese gentry to the Qi people are allowed to go to the museum to learn astronomy, sentence stocks, shipbuilding, and instrument making. ”

3. Ancient poems related to astronomy.

1. Zhang Heng of the Han Dynasty "Book of the Later Han Dynasty: The Biography of Zhang Heng": "Astronomical lunisolar calendar. ”

2, the unknown "Yi Ben" of the Song Dynasty: "Look at the astronomical dry drama again, in order to observe the changes in the whole crime." ”

3. Ge Hong of the Jin Dynasty "Hug Puzi Boyu": "The mountain charm foolish cow dove knows that the rain is in the future, and it can't be written tomorrow." ”

4. The unknown "Book of Sui and the Book of Sui Zhi III" of the Sui Dynasty: "Astronomers, so observe the changes of the stars, and those who participate in politics." ”

5, the second act of Lao She's "Teahouse": "You are so knowledgeable, you know astronomy, and you know how to forbid you." ”

Astronomy is the distribution and movement of celestial bodies in the universe.

The ancients included wind, clouds, rain, dew, frost, snow and other geomorphological phenomena in the scope of astronomy, and the astronomical lunisolar calendar was calculated.

Source 1: Astronomy is a discipline that observes and studies celestial bodies in the universe, which studies the distribution, motion, position, state, structure, composition, nature, origin and evolution of celestial bodies, and is a basic discipline in natural science. Mainly by observing the radiation emitted by celestial bodies to the earth, discovering and measuring their positions, exploring their motion laws, studying their physical properties, chemical composition, internal structure, energy** and their evolution laws.

Source: 3: Jin Ge Hong "Hug Puzi Bo Yu":

The dove knows that the rain is in the future, and it cannot be written tomorrow. "Sui Shu Jing Ji Zhi III": "Astronomers, so observe the changes of the stars, and those who participate in politics."

Lao She's "Teahouse" Act II: "You are so knowledgeable, you know astronomy and geography. ”

Astronomy also explores the origin, structure, evolution, and future outcome of the entire universe as we currently observe it in general, which is a sub-discipline of astronomy, cosmology. The time, direction and calendar were determined, which was also the beginning of astrometry.

Celestial bodies are the general term for various astral bodies and interstellar matter, such as stars (including the Sun), nebulae, planets (including Earth and Mars), moons (including the Moon), asteroids, comets, meteors, etc.

Any agglomeration of matter in the universe forms various objects of astronomical study. For example, the sun, planets, asteroids, moons, comets, meteoroids, interplanetary matter in the solar system, stars, star clusters, nebulae, interstellar matter in the Milky Way, and extragalactic galaxies, galaxy clusters, superclusters, intergalactic matter, etc. The infrared, ultraviolet, radio, X-ray and ray sources discovered by radio and space detection methods are also celestial bodies.

Artificial satellites, space-keeping rockets, space laboratories, lunar probes, planetary probes, interplanetary probes, etc., launched by humans and operated in space are called artificial celestial bodies.

Celestial bodies, also known as stars, refer to objects in space, and the broad interpretation of the text is that all individuals in the universe. The agglomeration of celestial bodies, thus forming the object of study of various astronomical states. Celestial bodies are the real existence of space matter in the universe, and they are also the general name for various astral bodies and interstellar matter.

Artificial satellites, spacecraft, space laboratories, lunar probes, planetary probes, etc., launched by humans and operated in space are called artificial celestial bodies.

The theory of the rotation of celestial bodies mainly discusses the movement of the axis of rotation of celestial bodies in space and inside the body and the change of the rate of rotation. Among them, the theory of the rotation of the earth has been discussed in great detail. The movement of the Earth's axis of rotation in the body-carrying part of the Earth's body causes the Earth's poles to move (see Pole Shift); At the same time, the orientation of the Earth's axis of rotation in space also changes (see Precession, nutation).

The rate of the Earth's rotation is also changing, ranging from long-term slowdowns, which increase the length of sidereal days by about (1 1000) seconds per 100 years, to short-period changes and irregularities (see Earth's rotation).

Celestial bodies refer to objects or structures in the observable universe whose existence has been scientifically confirmed, and is a general term for various stars and interstellar matter.

Definition of a celestial body:

Such as the sun, tracked stars, moons, asteroids, comets, meteors, interplanetary matter in the solar system, stars, star clusters, nebulae, interstellar matter in the Milky Way, as well as extragalactic galaxies, galaxy clusters, superclusters, intergalactic matter, etc. Infrared, ultraviolet, radio, X-ray and Y-ray sources discovered by radio and space detection methods are also celestial objects.

Discovery of celestial bodies:

Once upon a time, people could see stars in the night sky as long as it wasn't cloudy. In prehistoric times, most of the Earth had little to no light pollution, and our ancestors were able to see very faint starlight, some of which were classified as deep-sky by people today. In this way, some of these celestial bodies are as old as our human history.

Introduction to the Celestial Sphere:

We stand on the earth and look up at the starry sky, and see that the stars in the sky seem to be as far away as us. The stars are like jewels set in a circular canopy. The actual stars are far and close to us, and what we see is their projection on the surface of this huge sphere, which is called the celestial sphere, and its radius is infinite.

And the earth hangs over this celestial sphere**. The direction in which the stars move in the sky is not chaotic, and the shape of the constellations does not change.

Stars climb up from the horizon in the east, climb to their highest point (mid-heaven), and then sink to the west. It looks like the entire celestial sphere revolves around the Earth. I believe everyone understands that the earth is not the center of the universe, and the stars do not revolve around the earth.

The stars revolve around us in the sky because of the illusion of the Earth's rotation, and the celestial sphere itself does not move.

When we are in the earth, we don't feel like we're turning, just like when we ride a train, we see something moving backwards outside the window, but we don't feel like we're moving.

Categories: Science & Engineering.

Problem description: Are meteorites, gas and dust in interstellar space celestial bodies?

Analysis: Stars, nebulae, planets, meteors, comets, moons, and interstellar matter, collectively known as celestial bodies, are forms of matter in the universe. But what exactly is a celestial body? It's still a very vague concept.

The relevant textbook says: "Celestial bodies are objects that exist outside the earth's atmosphere that are observed in the sky, such as stars, planets, satellites, comets, meteors, nebulae and galaxies, etc., collectively referred to as "celestial bodies"; The earth we live on is also a heavenly body. When a round star falls to the ground, it becomes an object on Earth.

There is no mention of whether interstellar matter is a celestial body or not. In the Introduction to the Earth, it is clearly stated that interstellar matter belongs to celestial bodies.

In short, it can be said that as long as it is interstellar matter, it is a celestial body.