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Celestial Sphere - named by European explorers in the...

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Celestial Sphere The sky above looks like a dome…a hemisphere.. If we imagine the sky around the entire Earth, we have the celestial sphere. This a 2-dimensional representation of the sky Because it represents our view from Earth, we place the Earth in the center of this sphere. Remember…..you can’t ever see the whole celestial sphere at once. Things are in the way The Sun The Earth Constellation - a region of the sky, within official borders set in 1928 by the IAU. Often recognizable by a pattern or grouping of stars. Some patterns, like the Winter Triangle, span several constellations. Most official constellation names come from antiquity. Some southern hemisphere constellations were
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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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