Make way at the crossroads and bump into a spherical astronomical term

Make way for a ball at the crossroads-(sidereal day Heart Movement).

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The study of astronomy is of great practical significance to our life and has a great influence on human's view of nature. Ancient astronomers determined time, direction and calendar by observing the sun, the moon and other celestial bodies and phenomena. This is also the beginning of astrometry.

If people observe celestial bodies and record astronomical phenomena, the history of astronomy will be at least five or six thousand years. Astronomy occupies a very important position in the early history of human civilization.

The pyramids in Egypt and Stonehenge in Europe are famous prehistoric astronomical sites. Heliocentrism of Copernicus once liberated natural science from theology; Kant and Laplace's theory about the origin of the solar system opened the first gap in the metaphysical view of nature in the18th century.

The emergence of Newtonian mechanics, the discovery of nuclear energy and other events that play an important role in human civilization are closely related to astronomical research. At present, the study of high-energy astrophysics, compact stars and the evolution of the universe can greatly promote the development of modern science.

The study of celestial bodies in the sun and solar system, including the earth and artificial satellites, has many applications in aerospace, geodesy, communication and navigation. Astronomy originated from ancient human acquisition of seasons and divination activities.

Astronomy follows the development path of observation-theory-observation, and constantly extends people's horizons to new depths in the universe. With the development of human society, the research object of astronomy has developed from the solar system to the whole universe.

Now astronomy has formed three branches according to the classification of research methods: astrometry, celestial mechanics and astrophysics. According to the classification of observation methods, several sub-disciplines of optical astronomy, radio astronomy and space astronomy were formed. ?