Astronomy is a subject that studies the structure and development of space objects and the universe. The contents include the structure, nature and operation of celestial bodies. Astronomy is an ancient science. Since the history of human civilization, astronomy has played an important role.<BR>By observing the radiation emitted from celestial bodies to the earth, we can find and measure their positions, explore their motion laws, study their physical properties, chemical composition, internal structure, energy sources and evolution laws. [1]<BR>In the long history of astronomy, with the improvement and development of research methods, astrometry, astromechanics and Astrophysics have been established successively.<BR>
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