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| The study of the moon, stars, and other objects in space. |
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| The imaginary line that passes through the Earth's center and the North and South poles. |
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| Earth spinning on its axis. |
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| Earth's movement around the sun. It takes about 365.25 days, which is a year. |
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| The path of an object as it revolves around another object in space. |
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| A measurement of distance from the equator, expressed in degrees north or south. |
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| The two days of the year on which the noon sun is directly overhead at either 23.5 degrees north or south. |
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| The two days of the year on which neither hemisphere is tilted toward or away from the sun. During this time, the lengths of nighttime and daytime are around the same. |
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| Occurs around March 21 and marks the beginning of Spring. During this time, the lengths of nighttime and daytime are around the same. |
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| Occurs around September 23 and marks the beginning of fall. During this time, the lengths of nighttime and daytime are around the same. |
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| Occurs around June 21 and is the longest day of the year. The noon sun is directly overhead at 23.5 degrees north. |
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| Occurs around December 21 and is the shortest day of the year. The noon sun is directly overhead at 23.5 degrees south. |
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| The different shapes of the moon you see from Earth. |
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| The force that pulls objects toward eachother. |
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| A device built to study distant objects by making them appear closer. |
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| A round pit on the moon's surface. |
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| Dark, flat areas on the moon. |
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| The sun lights the "far side" of the moon. The "near side" is shaded. |
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| The side of the moon we never see from Earth. |
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| The side of the moon facing Earth. |
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| The length of time it takes the Earth's moon to revolve around the Earth (year) and to rotate on its axis (day). |
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| It is tilted at a 23.5 degree angle. |
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| The length of time it takes the Earth's moon to go from new moon to new moon. |
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| Phase of the moon that is shaped like a forward of backward "c." |
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| The sun lights the whole "near side" of the moon. |
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| You see the right half of the lighted moon. |
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| You see the left half of the lighted moon. |
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| They are caused by Earth's rotation and revolution. |
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| Earth has 366 days in a year every four years, because it takes about 365.25 days for Earth to complete a revolution. |
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| They are caused by the Earth's rotation. The part of the Earth that faces the sun has day and the part of the Earth that faces away from the sun has night. |
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| The direction in which the sun sets. |
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| The direction in which the sun rises. |
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| The phase before the full moon. |
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| The phase after the full moon. |
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