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17 Cards in this Set

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