axis, an imaginary line an object turns around , rotation , a complete spin on an axis , Revolution, one complete trip of one object around another object, equinox, the day when the Earth's rotation axis is leaning along Earth's orbit, neither toward or away from the sun. One this day we have equal amounts of day and night , solstice, the day when Earth's rotation axis is the most toward or away from the sun, gravity, a force which tries to pull two objects toward each other , mass, the measurement of the amount of matter in an object, weight, the measurement of the amount of effect of gravity on a given mass. , eclipse, when Earth or the moon casts a shadow on the other , tide, the rise and fall of the sea level caused by the gravitational pull of the moon and sun, tidal range, the difference between high and low tide .

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