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The moon is the sister world of earth. It is 7.35x10^22kg, has a diameter of 3476 km, and orbits the earth from an average distance of 384,400 km. It occupies an eccentric orbit since it is being acted upon strongly by the earth and the sun. It is most strongly affected by this phenomena when it is in line with the earth-sun vector, or at a full or new moon period. From my observations the moon seems to return to a similar phase in a period of a month. As it turns out the actual amount of time is actually 29 ½ days. This is not quite the same as its orbital period around earth. The orbital period is actually 27 ½ days. Since the earth has moved a substantial distance in its orbit around the sun, it takes a couple less days of movement for the m