What are the five constellations of Da Chun curve?

In the spring sky, the most striking thing is the Big Dipper (stars α, β, γ, δ, ε, ζ, η in Ursa Major) hanging high in the northern sky. Because the brightness of the seven stars is relatively large, it is easy to find.

Starting from the Big Dipper, you can find the main bright stars in spring: the two stars (β and α) connecting Doukou, extending to five times the distance between the two stars, you will find the brighter Polaris (α of Ursa minor); Looking southwest along the connecting line of the other two stars δ and γ in Doukou, you can find the bright Xuanyuan XIV (Leo α star).

A large arc can be drawn along the curves of several stars (δ, ε, ζ, η) on the barrel handle. If you extend this arc, you can find the bright orange star arcturus (alpha star of Capricorn), continue your southern tour, you can find another bright star Virgo of arcturus (alpha star of Virgo), and then continue your southwest tour, you can find a quadrilateral composed of four small stars, which is corvus corax. This big arc, which starts from the handle of a bucket and ends in corvus corax, is the famous "Big Spring Curve". The triangle consisting of arcturus, Cepheus and Leo β is called the "Spring Triangle". An equilateral quadrilateral consisting of a spring triangle and a star in Canis Canis is called a "spring diamond".