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10 Cards in this Set
- Front
- Back
Astronomy
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The study of the moon, stars, and other objects in space.
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Axis
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An imaginary line that passes through Earth's center and the North & South poles, about which earth rotates.
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Rotation
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The spinning motion of a planet on its axis. Earth's rotation takes 24 hrs.
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Revolution
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The movement of an object around another object. Earth's revolution around the sun takes 365.25 days.
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Orbit
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The path of an object as it revolves around another object.
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Calendar
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A system of organizing time that defines the beginning, length and divisions of a year.
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Summer Solstice
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The day of the year when the sun is closest distance to the North or South of the Equator. Longest day of the year.
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Winter Solstice
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The day of the year when the Sun is the furthest distance from North or South of the Equator. Shortest day of the year.
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Autumnal Equinox
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The day of the year in fall on which neither hemisphere is tilted toward or away from the sun.
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Vernal Equinox
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The day of the year in Spring on which neither hemisphere is tilted toward or away from the sun. First day of Spring.
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