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| round, three-dimensional object whose surface at all points is the same distance from its center |
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| imaginary line around which Earth spins |
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| spinning of Earth on its axis, which causes day and night to occur |
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| yearly orbit of Earth around the sun |
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| elongated, closed curve that describes Earth's orbit |
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| twice-yearly time when the sun is directly above Earth's equator and the number of nighttime hours equals the number of daylight hours worldwide |
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| point at which the sun reaches its greatest distance north or south of the equator |
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| changing appearance of the moon as seen from Earth, which depends on the relative positions of the moon, Earth, and sun |
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| moon phase that occurs when the lighted half of the moon faces the sun and the dark side faces Earth |
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| occurs shortly after a new moon, when more and more of the moon's lighted side become visible |
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| moon phase in which one-quarter of the moon's surface that faces Earth is lit up and occurs about a week after a new moon |
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| moon phase in which all of the moon's surface that faces Earth is lit up |
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| occurs after a full moon, when the amount of the moon's lighted side that can be seen becomes smaller |
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| moon phase in which only half of the lighted side of the moon is visible |
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| eclipse that occurs when Earth's shadow falls on the moon |
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| dark-volored, relatively flat areas of the moon that were formed when ancient lava filled basins on the moon's surface |
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| concentration of mass on the moon located beneath an impact basin |
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| eclipse that occurs when the moon moves directly between the sun and Earth and casts a shadow on part of Earth |
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