探测、研究太阳系和卫星表面环境的结构、组成、演化,测绘天体表面图像,研究天体环境与地球人类关系的学科。
方位,相对位置:方向,尤指用地理学的或天体图线测量的从一个固定位置到另一个位置的带有角度的方向。
Direction, especially angular direction measured from one position to another using geographical or celestial reference lines.
当中国的天文学家、地理学家张衡想画一副天体图时,他并不满足于仅仅画一张简单的纸质地图。
When Zhang Heng, the Chinese astronomer and geographer, wanted to draw a map of the heavens, he was not satisfied with a simple paper map.
当中国天文学家和地理学家张衡想画一幅天体地图时,他对简单的纸制地图并不满意。
When Zhang Heng, the Chinese astronomer and geographer, wanted to draw a map of the heavens, he wasn't satisfied with a simple paper map.
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