observable, able to be noticed, impacting, have a strong effect on something., phases, each of the stages a moon or a planet goes through in a month, based on its rotation around the sun., moon, the natural satellite of the earth, visible (chiefly at night) by reflected light from the sun., shadow, a dark area or shape produced by a body coming between rays of light and a surface., rotation, the action of rotating around an axis or center., revolution, a single orbit of one object around another., orbit, the curved path of an object or spacecraft around a star, planet, or moon., horizon, the line at which the earth's surface and the sky appear to meet., gravity, the force that attracts a body toward the center of the earth, tides, the rising and falling of the sea, usually twice each day at a particular place, due to the attraction of the moon and sun.

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