The position of the big dipper

The Big Dipper in Ursa Major is one of the famous northern constellations. Not far from Polaris, it belongs to the arch constellation (that is, it rotates around Polaris). It is characterized by being like a big spoon. The two stars on the edge of the spoon extend forward about 5 times, which is the Polaris. Polaris is not as bright as the Big Dipper.

Because the earth revolves around the sun while rotating, the direction of the barrel handle is different in every season on the earth. At around 7- 10 every night, the azimuth of bucket handle is fixed in every season. There are several formulas to explain the orientation of bucket handle in each season: "bucket handle faces east, and the world is spring;" Bucket handle faces south, and the world is summer; Bucket handle faces west, and the world is autumn; Bucket handle faces north, and it's winter in the world. "