How to find Polaris and Big Dipper?

The most striking of the Big Dipper is Shu Tian and Tian Xuan of Doukou. Because the connection between these two stars is about 5, if the connection is extended to the north celestial pole by 5 times (that is, 25), the North Pole can be found, so they are called Polaris. In addition, the distance from Shu Tian to Yaoguang (η star) is about 25, that from Shu Tian to Yuheng (ε star) is about 15, that from Shu Tian to Tianquan (δ star) is about 10, that from Tian Xuan to Tianqi (γ star) is about 8, and that from Tianqi to Tianquan is about 0. It is very convenient for us to remember these numbers to estimate the angular distance between stars with the naked eye because they are natural scales. From the Big Dipper, you can find not only the North Star, but also many bright stars all day, from which you can remember the constellations to which these bright stars belong. So the Big Dipper is also a guide to finding constellations. Take the starry sky in spring as an example to illustrate. Extending the connecting line between the two stars (δ and γ in Ursa major) and looking southwest, you can find the bright star Xuanyuan XIV (Leo α) on the head of Leo, which is like a sickle and always faces west. Extending outward along the curve of several stars in the barrel handle, you can draw a big arc, and you can find the orange 1 equal bright star arcturus of Sagittarius (Alpha star of Sagittarius). This big arc, which starts in bucket handle and ends at the corner, is called "big spring curve". The fifth constellation (Leo beta) at the tail of Leo forms a "Spring Triangle" with the constellations of arcturus and Virgo in Capricorn. The fifth constellation at the tail of Leo (Leo beta), arcturus of Capricorn and Virgo make up the "Spring Triangle". The connecting line between Shu Tian (α Ursa Major) and Celestial Pole (γ Ursa Major) extends outward, and you can see the dark constellation Canis, whose main star is cor caroli(α Ursa Major). Bighorn, Jiaosuyi, Emperor Yi and cor caroli form an equilateral quadrilateral, which is called "the big diamond in spring". Source: space exploration