How many constellations can you see with the naked eye _ which constellations can you see with the naked eye?

What constellations can we clearly see in the summer sky?

First, Scorpio

At about eight o'clock on a summer night, you can see a faint white chain in the starry sky, drawn from front to back, like a big river falling from the sky, wide and narrow. In ancient times, people didn't know what it was, so they called it Tianhe, expecting it to be composed of 100 million stars, big and small. Those stars are far away from us. To the naked eye, it looks like a sparkling, cloud-like non-Yun He, which we call the Milky Way. Scorpio is the eighth constellation on the ecliptic and the most beautiful constellation with the most stars on the ecliptic. On a summer night, you can see the stars extending into a D-shaped hook, which is very easy to identify.

Second, Sagittarius

Sagittarius, the ninth constellation on the ecliptic, lies in the east of Scorpio. At about eight o'clock in the summer evening, Scorpio will appear in the sky due south. Along the tail of Scorpio, several bright stars form a curve in the northeast, just forming an archery bow held by Sagittarius from north to south. Sagittarius is the best observation target in summer night, but it is also the position of the sun in winter. The sun enters Sagittarius every year from 65438+February 65438+June (because the earth revolves around the sun, we feel as if the sun is in air movement. When the coldest day in winter is the winter solstice (65438+February 22nd), the sun is just between M8 and M20, so this point is called the winter solstice in the sky.

Note: Looking for stars can compare the horoscope. When searching for Sagittarius nebula with binoculars or binoculars, it is easier to find it by comparing the star map with magnitude 6 or above.

Third, the swan constellation.

At about eight or nine o'clock in the evening of September, looking up at the center of the starry sky, you can find that three bright stars form a huge right triangle. Vega in the northwest is a blue and white star, and it is the fifth brightest star in the whole day. The white bright star standing upright in the south is called Altair, and the white first-class bright star in the northeast is just in the center of the Milky Way, which is the main star of Swan constellation-Tianjin IV.

The five bright stars of Swan constellation just form a huge cross, commonly known as the Northern Cross, and Bai Niao in Japan. It is located in the center of the Milky Way in summer and is very easy to identify.

Black hole is the most attractive term in recent ten years. In the center of the neck of Cygnus, there is a blue giant with the number HDE 226868, which is about twice as heavy as the sun. Next to this star, there is a star numbered Cygnus X- 1, which cannot be seen by naked eyes and optical telescopes. Although invisible, astronomers use the mathematical calculation of orbit and the observation of radio telescopes to find that invisible stars actually have mass.

Fourth, the summer triangle.

In summer, Vega in Lyra, Altair in Lyra and four or three first-class bright stars in Tianjin in Cygnus just form a huge right triangle in the sky, commonly known as the midsummer triangle.

Vega, the main star of Lyra, is the fifth brightest star in the whole day, such as blue, white and zero, and is one of the three bright stars in the northern sky (the other two are Capella and arcturus), which reflect each other with the three bright stars in the southern sky, Sirius, Eldora and South Gate.

Altair is the main star of Aquila, with a yellow-white surface and a magnitude of plus 0.8. It is the brightest 12 star in the whole day. Its surface temperature is lower than that of Vega, and its absolute brightness is 1 1 times that of the sun, approaching us at a speed of 26 kilometers per second.

At about eight or nine o'clock in the summer evening, when we are not outdoors, we look up at the sky and see the three brightest stars competing with each other, connecting these three bright stars, Vega, Cowherd and Tianjin to form a right triangle. The right angle point is located in Vega, which is the big triangle in summer. Vega is in the west, Tianjin is in the east and Cowherd is in the south.

V Ophiuchus, Ophiuchus and Libra

Giant snake, snake man, long snake and water snake constitute four constellations related to snakes in the sky, among which water snake is located in the Antarctic circle and must be seen in the southern hemisphere; You can see the long snake in the sky in spring. The long snake is the longest constellation in the sky, and Ophiuchus is just caught by Ophiuchus and divided into two parts. It is the only one that is divided into two sides all day. Ophiuchus and Ophiuchus are the largest constellations, occupying more than 1500 square degrees in the sky. Later, it was divided into two constellations, with Ophiuchus in the middle, Ophiuchus tail in the east and Ophiuchus head in the west.

Libra lies to the east of Virgo. This Libra is a tool used by Virgo, the goddess of justice, to measure good and evil. There is a legend that there was a time when the autumnal equinox was located in this constellation. When the sun moves to this constellation, day and night are equally divided, just like Libra, so it is called Libra.

Ophiuchus, Ophiuchus and Libra are all dark constellations in the bright starry sky in summer. Although it is not as glamorous and lovely as the Cowherd and the Weaver Girl, it is easy to find because of its moderate position, as long as it is compared with the horoscope and the eight characters.

Six, Draco

Between the Big Dipper in Ursa major and the Little Dipper in Ursa minor, there are some small stars winding around Ursa minor until between Cepheus and Lyra, forming a dragon in the sky, which is the dragon constellation we want to introduce. For people living in high latitudes above 40 degrees north latitude, Draco will never see it fall below the horizon. It seems to revolve around the North Pole year after year, so some people call it the polar dragon.

There are two quite famous meteor swarms in Tianlong Star, one of which radiates near ι (left pivot) and reaches its climax in the early morning of 1 month 4 every year. On average, there are more than 50 meteors in an hour, scattered in all directions from this direction, which is very spectacular, commonly known as the Dragon Meteor Shower. One is the Jacobian meteor shower, which is predicted by the earth passing through the orbit of Jacobian comet every 13 years.