Sun - the star at the center of our solar system, Earth - third planet from the sun, Gravity - force that pulls objects toward center of Earth, moon - natural satellite of Earth, rotation - the spinning of earth on its axis, axis - a line around which something spins, shadow - a dark area caused when an object blocks light, sundial - an instrument that measures time during the day using the position of the sun, revolution - the movement around of one object around another,

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