Any two masses attract each other with a force equal to a constant
Orbit
The curved path around an objec
Kepler's law
Each planet revolves in an ellipse
Night
He period of darkness
Day
The time between sunrise and sunset
Equinox
The time when the day and night are equal lengths
Solstice
Either of the times a year when the sun at its greatest distance from the celestial equator
Tilt
To cause to lean
Rotation
The act of spinning
Revolution
A turn around
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