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phys0001_chapter03

phys0001_chapter03 - Chapter 3 Celestial Sphere and Star...

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Chapter 3 Celestial Sphere and Star Atlas We will talk more about the celestial sphere and how to tell the positions of the stars in the sky. We will also introduce the constellations and the star atlas. Celestial Sphere When we look at the sky, it is difficult to tell how far the stars are. It seems that all the stars lie on a "flat" surface. A similar situation is watching television, the screen of the television represents the three dimensional world. The sky "surrounds" us from all directions. We placed ourselves at the center of an imaginary sphere, the celestial sphere . Everything on the sky will appear on the celestial sphere. As mentioned in the last chapter, the celestial sphere does not follow the rotation of the Earth. Thus, stars are fixed on the celestial sphere. We need a coordinate system to tell the positions of the stars on the celestial sphere. It is very similar to the longitude and latitude on the Earth surface. The projection of the rotational axis of the Earth marks the
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