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11 Cards in this Set
- Front
- Back
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Define astronomy
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the study of the universe
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Define year
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the time required for the earth to orbit once around the sun
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Define month
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a division of the year that is based on the orbit of the moon around the Earth
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Define day
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the time required for Earth to rotate once on its axis
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Define telescope
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an instrument that collects electromagnetic radiation from the sky and concentrates it for better observation
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Define refracting telescope
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a telescope that uses a set of lenses to gather and focus light from distant objects
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Define reflecting telescope
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a telescope that uses a curved mirror to gather andfocus light from distant objects
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Define constellation
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a region of the sky that contains a recognizable star pattern and that is used to describe the location of objects in space
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Define zenith
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the point in the sky directly above an observer on Earth
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Define altitude
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the angle between an object in the sky and the horizon
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Define horizon
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the line where the sky and the earth ppear to meet
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