Astronomical Terms Describing Sky

Astronomical Terms Describing Sky - Astronomical Terms...

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Astronomical Terms Describing Sky's Motion Even though we now know that the earth is spherical, rotates daily on its axis, and revolves around the sun, the best way to actually understand the motion of the starry sky is think of yourself as at the center of a circular flat earth, with the sun, moon, planets and stars all at the same distance, as if attached to the inside of a planetarium dome. With that in mind, you need to know the following terms: The Celestial Sphere: A simplified model of the sky, where all the stars are considered to be the same distance away from us, on the inside surface of a sphere, called the "celestial sphere." Zenith: The point on the celestial sphere exactly overhead. Meridian: The North-South semi-circle on the celestial sphere from the north point on the horizon, passing through the zenith to the south point on the horizon. Because we are ignoring the distances to the stars, only two coordinates (numbers) are used to describe exactly where a star in the sky is (see illustration):
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Astronomical Terms Describing Sky - Astronomical Terms...

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