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Unformatted text preview: named by European explorers in the 17th & 18th centuries. The patterns of stars have no physical significance! Stars that appear close together may lie at very different distances. Modern astronomers use them as landmarks. Celestial Sphere, Cont. North & South celestial poles: the points in the sky directly above the Earth’s North and South poles celestial equator: the extension of the Earth’s equator onto the celestial sphere ecliptic: the annual path of the Sun through the celestial sphere, which is a projection of ecliptic plane (it is 23.5 degrees to the equator because of the tilt of the Earth’s Axis)...
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- Spring '08
- Astronomy, Equator, Ecliptic