Imagine a line going through Earth connecting the North and South Poles. Why do astronomers use the Celestial Coordinate System. The Sky Above Astronomy The Sky And The Solar System 5 - Explain why glass prisms disperse light. . Early astronomers get confused as they viewed the motion in the sky because they tried to explain it in terms of the geocentric theory. Explain the system astronomers use to describe the sky. Define the reference markings used to establish the Celestial Coordinate System. Retrograde motion occurs when a planet far from another planet and from which it is seen rotates at lower speed creating the impression that it is retrograding with respect to the other planet. The idea of a magnitude scale dates back to Hipparchus around 150 BC who invented a scale to describe the brightness of the stars he could see. Directions of objects in the sky can be denoted by their position on the celestial sphere circum...
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