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astronomy vocab

TermDefinition
Constellations a group of stars forming a recognizable pattern that is traditionally named after its apparent form or identified with a mythological figure. Modern astronomers divide the sky into eighty-eight constellations with defined boundaries.
Zenith the highest point reached by a celestial or other object.
Altitude the height of an object or point in relation to sea level or ground level.
Horizon the line at which the earth's surface and the sky appear to meet.
Light Year a unit of astronomical distance equivalent to the distance that light travels in one year, which is 9.4607 × 1012 km (nearly 6 trillion miles).
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