How many stars does Nandou Star consist of?

Nandou Star, a spoon-shaped constellation composed of six stars, was worshipped by the people of ancient China, just like the same day, the moon and Beidou. Nandou Six Stars: Tianfu Star, known as Douyi in astronomy and Ling Xing in ancient times; The morning star, known as Dou Er in astronomy, was called Yin Star in ancient times; Secret star, that is, fighting three, is called good star in ancient times; Tiantongxing, namely Dou Si, was called Fuxing in ancient times; Star, that is, fighting five, the ancient name of India star; Kill seven stars, that is, battle six, ancient star.

On a clear summer night, Sagittarius is bright and visible in the southern sky. What is more striking is that Sagittarius has six bright main stars, which form a "North-South Fight", which is beautiful and unique. The Big Dipper is in Ursa Major and the South Dipper is in Sagittarius. Purple MSI is usually called Polaris, and it is also the Emperor Star. When Polaris is due north, that is, when it passes through the meridian, Polaris passes through the meridian twice a day.

It's time to observe the six stars in Nandou.

"The moonlight is half deeper, and the Beidou is weak. Tonight, I know that spring is warm, and through the green screen window, the sound of insects is fresh "(Tang Liu, Moonlit Night). Beidou and Nandou in the poem are two legendary stars among the traditional star officials in China. They are north and south, so they don't have much time to watch at the same time. Moreover, after nightfall in August every year, it is a good time to watch double fights at the same time, instead of waiting until midnight like a poet.

Nandou is located in Sagittarius, more than 20 degrees south of the celestial equator. For observers in mid-latitude areas of the northern hemisphere, the best observation time is in summer night. At about 2 1 hour in mid-August every year, Nandou Liuxing reaches its maximum height and is located in the south. 9. 10, when it gets dark, it has been inclined to the southwest low altitude, and the observation conditions are getting worse and worse. In June165438+1October, it has already fallen after dark, and it will only rise again in July next year.

Reference to the above content: Baidu Encyclopedia-Nandou Star