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| The study of the moon, stars, and other objects in space. |
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| An imaginary line that passes through Earth's center and the North and South poles, about which Earth rotates. |
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| The spinning motion of a planet about its axis. |
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| The movement of an object around another object. |
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| The path of an object as it revolves around another object in space. |
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| The distance north or south from the equator, measured in degrees. |
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| The two days of the year on which the noon sun is directly overhead at either 23.5° South or 23.5° North. |
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| The two days of the year on which neither hemisphere is tilted toward or away from the sun. |
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| The day of the year that marks the beginning of spring in the Northern Hemisphere. |
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| The day of the year that marks the beginning of fall in the Northern Hemisphere. |
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| One of the different shapes of the moon as seen from Earth. |
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| The partial or total blocking of one object by another. |
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| The blocking of sunlight to Earth that occurs when the moon is between the sun and Earth. |
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| The darkest part of a shadow. |
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| The part of a shadow surrounding the darkest part. |
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| The blocking of sunlight to the moon that occurs when Earth is directly between the sun and moon. |
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| The daily rise and fall of Earth's waters on shores. |
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| The attractive force between two objects; its magnitude depends on their masses and the distance between them. |
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| Any object that revolves around another object in space. |
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| The orbit of a satellite that revolves around Earth at the same rate that Earth rotates. |
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| A device built to study distant objects by making them appear closer. |
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| A bowl-shaped area that forms around a volcano's central opening; A round pit on the moon's surface. |
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| Dark, flat regions on the moon's surface. |
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