astronomy
Astronomy (astronomy) is a discipline that observes and studies cosmic celestial bodies. It studies the distribution, movement, position, state, structure, composition, nature and origin of celestial bodies (including satellites, planets, stars, nebulae and galaxies) Evolution, but also to study some of the phenomena outside the Earth's atmosphere, such as supernova, gamma ray bursts and cosmic microwave background radiation, is a natural science in a basic discipline. Cosmology and astronomy, and the difference is that the universe as a whole to study. One of the significant differences between astronomy and other natural sciences is that the experimental method of astronomy is to observe and collect the various information of the celestial bodies by observation. Therefore, the study of observation methods and observation methods is an attempt by astronomers to study. In ancient times, astronomy was inseparable from the development of the calendar. ...