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"Astronomy definitions"

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Words
astronomical unit
celestial sphere
circumpolar constellations
circumpolar stars
declination
eccentricity
ecliptic
ellipse
geocentric viewpoint
heliocentric viewpoint
horizon
light year
meridian
minor axis
north celestial pole
reflecting telescope
right ascension
semi- major axis
semi-minor axis
sidereal period
south celestial pole
synodic period
zenith