Charming summer night, what are the three stars in the summer triangle?

There is a particularly charming scenery in the summer night sky. Because of this landscape, people prefer summer-that is, the summer triangle that people can watch in the summer night sky. The summer triangle is most obvious in summer. Then, let's follow the constellation knowledge to find out which three stars the Summer Triangle refers to.

The summer triangle consists of Vega in Lyra, Tianjin IV in Cygnus and Hegu II in Eagle (the famous Altair), in which Vega is located at the right vertex of the triangle. These three stars are the brightest stars in their constellation. After entering the summer, as long as the weather is fine, you can see this huge and obvious triangle every night. In autumn, with the passage of time, the rising time of the triangle will gradually advance, which is caused by the change of the earth's spatial position, and it is a cycle every year.

In summer, the summer triangle can only be seen on cloudy days. At night, the summer triangle in the mid-latitude area of the northern hemisphere will rise to the zenith; In autumn, you can still easily see the sunset in the western sky. The west of the triangle is Vega, the east is Tianjin four stars, and the southeast is Hegu two. People can also find the splendid Milky Way in this big triangle, which extends outward from the triangle, crosses the north and south, and divides into two forks.

Every star in the Summer Triangle is unique, and its biggest feature is "big". Hegu II (distance 17 light years) is about twice the diameter of the sun, Weaver Girl I (distance 25 light years) is about three times the diameter of the sun, and Tianjin IV (distance 2600 light years) is Supergiant star, which is 200 times larger than the sun. These three stars are easy to see under the lights of medium-sized cities and suburbs.

The Weaver Girl rotates so fast that its equator is 23% bigger than its poles. People see the star from one pole, not from the side. On the lower right of Weaver Girl 1, you will find Hegu 2 in Eagle. To find the brightest star in Cygnus (or "Northern Cross"), you should straighten your arms and clench your fist, which is at the lower left of Weaver Girl 1.

Tianjin's Big Four is surprisingly huge and far ahead of Samsung. Although the apparent magnitude is only+1.25, if Tianjin IV is placed at the distance of 1, it will reach -7.8, which is almost as bright as half the moon and can reflect obvious shadows. Tianjin IV's western name Tianjin IV means "tail" in Arabic, which means it is located on the tail of a swan.

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