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第一节 天体和天体系统[地球是一个天体 ]地球是一个类似正圆的椭球形天体 ,表面分为海洋和陆地两大单元 ,外面包围着大气层。[北斗七星图形的变化图 ]恒星也是有运动的 ,只是变化很微小 ,短期内难以觉察到 ,并且不同的恒星运动的方向、速度也不同。[九月的星空间 ]1 此图为九
Section 1. Celestial Body and Celestial Body System [The Earth is a celestial body] The Earth is an ellipsoidal body with a perfect circle. The surface is divided into two major units: the ocean and the land, and it is surrounded by the atmosphere. [Change Diagram of the Big Dipper Graphic] Stars are also mobile, but the changes are very small and difficult to perceive in the short term, and the direction and speed of different star movements are also different. [September’s Star Space]1 This picture is nine