After watching many TV dramas, there have been some unusual astronomical phenomena, such as "seven stars connecting beads" and "nine planets connecting beads". When these celestial phenomena happen, heroes will pass by, which is of course fiction. If this really happens, then the first reaction should not be to pass or fail, but what is the significance of this phenomenon in astronomy. But today, there will be "four-star alignment". What's wrong with the four-star arrangement? What planet is it?

165438+14-star queue on October 29th.

Astronomers said that on the evening of 29th, Saturn, the moon, Venus and Jupiter will gather in the sky, aligned with the southwest low point of 0, and staged an astronomical spectacle of "four-star alignment".

The moon, called the moon in ancient times, is the only natural satellite on the earth. As the three major planets in the solar system, Saturn enjoys the reputation of "Lord of the Rings". Venus is called "Taibai" in China. When it appears in the morning, people call it "Seven Stars". When it appears at dusk, people call it Chang Geng. Jupiter is considered to be a huge planet.

Shi Zhicheng, a member of the Chinese Astronomical Society and director of the Tianjin Astronomical Society, said that Saturn, Venus and Jupiter were all bright in this astronomical event. In terms of brightness, Venus is the brightest. )), followed by Jupiter and Saturn; From the azimuth angle, Jupiter is at the lower right of Venus and Saturn is at the upper left of the moon. These four bright celestial bodies are embedded in the blue sky like gems, competing to shine and becoming a beautiful landscape on the horizon.

"The sun sets for 30 minutes, and the horizon will drop to about 10 degrees. Interested citizens had better find a place with a wide field of vision in advance and watch it with naked eyes or binoculars, while avoiding the pollution of urban light sources. People who like celestial photography may wish to shoot this rare astronomical phenomenon with a special scene as the background. " Shi Zhicheng warned.

Astronomical experts also said that although "four-star renju" is rare, it is only a normal astronomical phenomenon. The public should face it with a normal heart, just appreciate it and don't associate it with good luck or bad luck.

2. What is planetary conjunction?

The so-called planetary convergence is an astronomical phenomenon. When the planets are arranged on the same side of the sun, this is called planetary convergence. Planetary arrangement is divided into nine planets arrangement, eight-star arrangement, seven-star arrangement, six-star arrangement and five-star arrangement. Usually, when planets are almost in a straight line, people call it "planetary conjunction". In this sense, "planetary conjunction" is only a "visual phenomenon" that people are interested in.

The last "planetary rendezvous" took place at 0: 00 on May 20th, 2000 with an angle of 12.6 degrees.

3. Five-star arrangement

Five-star arrangement, also known as "five-star gathering", was used in ancient China to indicate that the five planets of water, gold, fire, wood and earth appeared on the same side of the sky at the same time, that is, the five stars were on the same straight line. This phenomenon does not happen often, so the ancients once idealized it as a symbol of good luck. As long as the five planets live in a palace and are connected one after another, the word "gobang" will be popular in later generations. Astronomers explained that the "five-star arrangement" takes the earth as the center, and Jin Mu's water, fire and soil are all on the side of the sun. When people go out into the sky at night, the opening angles of the five planets are less than 60 degrees, which can be observed by the naked eye.

Why is there a five-star arrangement? Experts explained that our solar system is centered on the sun and eight planets revolve around it. Mercury, the closest to the sun, runs the fastest, making a revolution in 88 days. On the other hand, Pluto is the farthest from the sun and runs the slowest, rotating once in 248 years. From the earth's point of view, planets move from far to near and from east to west from time to time. When the opening angle of the five planets entering our field of vision is less than 60 degrees, an interesting astronomical phenomenon "five-star arrangement" will appear. Experts revealed that the key to observing the "five-star arrangement" is to observe Mercury. As long as you can see mercury, you can see the "five-star arrangement". Two days before and after May 5, when night falls, Venus, the brightest star in the low altitude, can be seen from the west. At night, you can find dark yellow mercury under Venus. There are Mars and Saturn on Venus. Jupiter, located in the western sky, is second only to Venus in brightness. In terms of brightness, Mars is the darkest, blood-red, located in the north of Saturn.

According to statistics, from 190 1 to 2 100, there are at least 15 "five-star parties" and "seven star party". In China, the ancients believed that the appearance of "five-star arrangement" was a symbol of good luck. But astronomers believe that the "five-star arrangement" has nothing to do with the rise and fall of society and climate.

4. Seven-star arrangement

"Planetary conjunction" is a "visual phenomenon". The phenomenon of "planetary conjunction" is not strictly defined. Generally speaking, with the naked eye, the planets are almost all in a straight line. People call it "planetary rendezvous". According to this definition, even if the motion of the planet is displayed on the screen, it is not easy to observe the motion of the planet and find the moment of "planetary conjunction", not to mention that "planetary conjunction" varies visually from person to person. The 30-year-old "Seven Stars".

Nine stars in rapid succession.

According to the calculation results, what happened during the 6000 years from 300 1 year BC to 3000 BC? Scientists tell us that the "six-star arrangement" happened 49 times and the seven-star arrangement happened three times. When the angle is less than 5 degrees, there will be no more than eight stars in a row. If the angular spread is 10 degree, there are 709 "six-star arrays", 52 "seven-star arrays" and 3 "eight-star arrays". In order to recognize the occurrence of "Nine Planets Arrangement", the angle must be enlarged to 15 degrees. Even so, the "Nine Planets Arrangement" only appeared once in 6000 years. This is the "Nine Planets Arrangement" that happened in February of 149+ 10. The angle is 14.8 degrees. Planets gather in a specific area of the night sky.

Therefore, people think of using computers to automatically search for "planetary conjunctions". To use electronic computers, we must give an accurate definition of "planetary conjunction". Scientists have determined the "planetary conjunction" according to the following four premises: first, take the position of the running star as the projection position on the ecliptic plane; Secondly, on the ecliptic plane, the planets gathered near the connection line between the sun and the earth are considered as "planetary knots", excluding "planetary knots" and the sun. Thirdly, the acute angle of the included angle formed by the connection between the earth and other planets and the connection between the sun and the earth is less than 90 degrees as a quantitative "index" of "planetary convergence"; Fourth, determine the angle of each planet at the same time, and take the maximum angle formed by this angle. The time when the maximum angle becomes the minimum value is regarded as "planetary convergence". Here, consider the number of planets from 6 to 9 and study the combination of all planets in the solar system. The earth must be included.