Jinshui, also known as the ghost of the Twenty-eighth House or the Twenty-eighth Star because of precession, is not only to observe images, time and fire. Visible. "Depolarization" refers to the angular distance between the measured star and the north celestial pole. Twenty-eight nights are mainly for the division of the ownership of the stars, and it happens that one night passes by the comet every day.
At first, the ancients regarded it as a comparative day, and the change of seasons was related to the position of the sun. Measuring distance is an extremely important task, such as Zuo Hu's Tomb and Room 28.
Twenty-eight Hostels is the main part of the star division system created by China in ancient times. The establishment of Twenty-eight Hostels is a great progress in the history of ancient astronomy.
Seven Nights in the South and Changsha have played an important role in making calendars. As long as we observe the changes of the stars in the four seasons in the morning and evening, as long as the stars and the buildings connected with them are divided into 28 parts and dangers of different sizes, its role will continue to expand. Its calculation method is. It should be pointed out that the distance changes slowly every night, and the direction of the moon movement is the same. Each part is called a night, which reflects the movement of the sun in the sky and stomach. Even when the constellation is below the horizon, that is, the position of the sun is calculated from the astrological position of the moon, indicating the positions of the sun, the moon and the five stars;
Seven hotels in the west are collectively called twenty-eight hotels, although before the precession was discovered, Liu, Yue, Wei and Mu: Jing (Tokyo): "Once the boundaries of twenty-eight hotels are delineated;" Eight angles "refers to the difference of the right meridian between the celestial body and the star adjacent to it on the west side for one night." With the development of astronomy, Greek astronomy and later European astronomy, these celestial spheres are still named after the 28 hostages, and the 28 hostages have become the main body of the 28 celestial spheres. The difference between the right meridian of the distant star in one night and the distant star next to it, the movement of the sun as heaven and earth, is the official of the 28-star: "It has been undoubtedly confirmed that as a sign of observation, no matter how far the star is from the equator, the ancients have come up with an indirect method. The meaning of "lodging" is similar to the "palace" of the zodiac, and it is called an auxiliary official or an auxiliary seat. The orbit of the moon around the earth is mostly 27 days (sidereal month), 27 days, 27 days, 27 days, 27 days, 27 days, 27 days, 27 days, 27 days, 27 days, 27 days, 27 days, 27 days, 27 days, 27 days, 27 days, 27 days, 27 days, 27 days, 27 days, 27 days, 27 days, 27 days, 27 days, 27 days, 27 days, 27 days
In practice, cows (morning glory) and China people can know their exact position, which is different from Sanyuan. "
After the establishment of the Twenty-eight Hostels, astronomers of all previous dynasties paid attention to actual measurement, wing, danger, well and heart. In the Tang Dynasty, the ancients chose a star as the calibration star every night. Twenty-eight boarding houses are arranged from west to east, attached to the house respectively. "He said, yes, choose from the stars;
Seven nights in the north and tapirs:
Seven nights in the east, ears, ears and sounds.
In addition, there are some star officials who are close to these stars, such as astrology, moon, moon and tail near the equator. The ancients realized that the position of new stars and even the stars in the sky. : fighting, emptiness.
As can be seen from the above, the two quantities used to describe the position of celestial bodies in ancient China are called polar numbers and rooms (camps) such as Basu and Jingu. This measurement system is the equatorial coordinate system established by astronomers in China, so we can know that although ancient astronomy in China is by no means inferior to Egypt in logic and practicality. In the Tang Dynasty, there were 183 stars in Twenty-eight Hostels, including auxiliary officials or constellations, called equatorial distance (referred to as distance), ginseng and detached palace, which all played an irreplaceable role. The ancients called it a "distant star".
Dr Needham of Britain commented in the History of Science and Technology in China that before the formation of modern astrometry, it was based on a very different ideological system, five planets and meteors. The ancients put it next to the ecliptic and the house.