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| occurs only at a New Moon within the umbra a total eclipse of the sun is seen |
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| is the darkest part of the shadow, where the light source is completely blocked by the occluding body. An observer in the umbra experiences a total eclipse. |
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| is an astronomical event that happens twice each year when the Sun's apparent position in the sky reaches its northernmost or southernmost extremes. |
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| is the superseded theory, that the Earth is the center of the universe, and that all other objects orbit around it. |
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| is the astronomical model in which the Earth and planets revolve around a stationary Sun at the center of the solar system. |
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| The Sun rotates on its axis once in about 27 days |
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| Orbital motion about a point, especially as distinguished from axial rotation |
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| Any object that revolves around the planet |
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