Can the Big Dipper be seen everywhere? How can we judge the direction according to it?

The Big Dipper is seven bright stars arranged in barrels in the northern sky, which can be seen basically except cloudy days. In mid-June, 5438, the Big Dipper was not seen in the Yangtze River valley+10. Relative to Polaris, the position of the Big Dipper is basically unchanged, but the rotation of the earth will make people think that the Big Dipper revolves around Polaris (actually around the earth axis). If you keep watching the Big Dipper at night, you will find that it also rotates from east to west, and you can't see it when the sun comes out during the day. As for how to judge the direction according to it, the handle of the Big Dipper only refers to one direction every season. In the words of the ancients, it is: "bucket handle refers to the east, and the world is spring; Bucket handle guide, the world is summer; Bucket handle refers to the west, and the world is autumn; Bucket handle refers to the north, and it is winter in the world. " Of course, due to the rotation of the earth, this phenomenon must be seen after eight o'clock in the evening. March to May is spring every year. Take the starry sky seen at eight or nine o'clock in the middle of April as an example. Then you will see the Big Dipper bucket handle pointing east. June to August is summer every year. Take the starry sky seen at eight or nine o'clock in mid-July as an example. At this time, the bucket handle of the Big Dipper points to the south. However, in the middle of June of 5438+ 10, the Big Dipper has reached the low altitude in the north. At this time, it is not easy to see the Big Dipper in the area south of the Yangtze River Basin in China. However, please rest assured, you have to realize that there is still an "assistant" to replace the Big Dipper, and that is the Hou Xian constellation. At this time, the constellation Xianhou appeared above the head. Its main bright star forms a W-shape. You can also find Polaris by extending the connection between Alpha and κ.