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17 Cards in this Set
- Front
- Back
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astronomy
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the study of all physical objects beyond Earth.
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calendar
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a system for organizing time
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year
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the time required for the Earth to orbit the sun once
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month
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roughly the amount of time required for the moon to orbit the earth once
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day
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the time required for for the Earth to rotate once on its axis
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leap year
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A year in which an extra day is added to the calendar
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constellations
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sections of the sky that contain recognizable star patterns
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altitude
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the angle between the object and the horizon
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right ascension
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measured in hours eastward from the vernal equinox
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declination
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measured in degrees north or south of the celestial equator
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celestial equator
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an imaginary circle created by extending Earth's equator into space
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ecliptic
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the apparent path the sun takes across the celestial sphere each year, as seen from Earth
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light-year
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a unit of length equal to the distance that light travels through space in 1 year
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telescope
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an instrument that collects electromagnetic radiation from the sky and concentrates it for better observation
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refracting telescope
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uses a set of lenses to gather and focus light
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reflecting telescope
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uses curved mirrors to gather and focus light
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electromagnetic spectrum
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made up of all wavelengths of electromagmetic radiation
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