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| − | == Definition ==
| + | The '''Celestial Sphere''' is anything above the [[troposphere]]. In the [[Einstein]]ian [[Theory of Relativity]], the [[Earth]] can be thought of as a point of reference. |
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| − | The Celestial Sphere is anything above the [[troposphere]]. | |
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| − | In the Einsteinian Theory of Relativity, the earth can be though of as a point of reference. | |
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| | == Introduction == | | == Introduction == |