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12 Cards in this Set
- Front
- Back
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The study of all physical abjects beyond earth.
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Astronomy
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A system of organizing time.
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Calendar
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The time required for the Earth to orbit around the sun.
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Year
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Roughly the amount of time required for the moon to orbit around the earth once.
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Month
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A year in which an extra day is added to the calendar is called.
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Leap Year
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Mirrors are used to focus light in a.
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Reflecting Telescope
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Sections of the sky that contain recognizable star patterns.
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Constellations
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The first scientist to successfully use a telescope to observe the night sky.
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Gallieo
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Astronomers divide the sky into.
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Constellations
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The line where the earth and sky meet is called.
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Horizon
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The best place for an astronomer to observe the sky and take measurements.
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Mountain top
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One complete rotation of the Earth on its axis is the basis for length of a.
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Day
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