Origin and application of constellation diagram

On a clear night, it is fascinating and fascinating to look up at the twinkling stars and discuss their ins and outs. Stories such as The Cowherd and the Weaver Girl, The Seven Fairys Descending from Earth are very popular and touching myths about the stars in China. Royal Constellation, Aquarius and the South Fish and Maiden are famous fairy tales of ancient Greece.

Because the mutual position of the stars seems to be constant, they appear in different directions in the sky at different times with the rotation and revolution of the earth. When you get lost in the wild at night, you can look for the North Star. Polaris is in the north pole of the earth's rotation axis, and it is in the northern sky. Ancient navigators could determine their course by observing the positions of nine selected stars in the sky ("Nine Navigational Planets"). Contemporary interstellar navigation is also guided by stars. Apollo 1 1 The manned moon landing spacecraft used optical locators to locate the stars and ensure that the spacecraft would run along the established orbit. Knowing the stars can also determine the time. For example, around 20 o'clock on New Year's Eve, Orion's "Samsung" is just in the southern sky. Ancient Egyptians could predict whether the Nile would flood by observing the starry sky. People in the Yin Dynasty in China could know whether to start sowing by observing the stars.

The starry sky is divided into southern sky and northern sky. There are currently 88 constellations in the starry sky.