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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