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Universe
Everything that exists.
Revolution
The amount of time to go once around the sun.
Rotation
Spinning on an axis.
Celestial object
Anything outside Earth’s atmosphere.
Focus
A fixed point.
Altitude
The angular distance of a celestial object about the horizon.
Eccentricity
Out of roundness.
Tides
Rising and falling of the oceans caused by the moon’s gravitational attraction to the earth