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Definition
| The furthest point in an orbit. |
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| An object spins around an imaginary line called the axis of rotation. |
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| A flat plane that an elliptical orbit lies in. |
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| The two days of the year with exactly 12 hours of daylight. |
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| A phenomenon in which carbon dioxide and other gases trap solar radiation in the atmosphere, causing global air temperature to rise. |
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Definition
| The model of the solar system that states that planets orbit the sun. |
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| The year in which a day gets added to the end of February in order to account for the difference in the calendar versus Earth's period of revolution. |
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| The changes in the moon's appearance from Earth over the course of a month. |
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Definition
| When the moon enters Earth's shadow. |
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Definition
| The closest point in an orbit. |
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| The various shapes the moon has over the course of a lunar cycle. |
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Definition
| The movement of a objects axis of rotation. |
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Definition
| The astronomical model that states that Earth is the center of the universe. |
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Definition
| The motion of an object orbiting around something else. |
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Definition
| The motion of an object spinning around an axis. |
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Definition
| When the moon blocks out the sun's light. |
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Definition
| The day of the year with the most daylight. |
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Definition
| Period of the lunar cycle where the moon appears smaller and smaller. |
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Definition
| Water in its gaseous form. |
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Definition
| Period of the lunar cycle where the moon appears larger and larger. |
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Definition
| The day of the year with the least daylight. |
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