从地球上看，我们将地球赤道往天际延伸之后我们称之为天体赤道，也就是现在被描述成天空四周的一个圆形区域。当地球沿着轨道绕太阳公。
A circle all around the sky. We can also imagine that while the Earth orbits around the sun, from down here on the surface.
这仪器又称浑象，球上刻有星宿赤道黄道等，主要是用来显示天体在不同时间的位置。
The sphere , which was marked with stars , the celestial equator and the ecliptic , was mainly used to show the positions of celestial objects at different times.
赤道坐标系统用来显示天体在天球上的真实位置。
RA/dec coordinates are the standard system used to specify the position of an object in the sky.
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