Earth - the planet on which we live; the world, Moon - the natural satellite of the earth, visible (chiefly at night) by reflected light from the sun., Sun - the luminous celestial body around which the earth and other planets revolve, from which they receive heat and light, which is composed mainly of hydrogen and helium, rotation - one complete turn, revolution - apparent movement of such a body round the earth, tilt - to cause to have an inclination, axis - a straight line about which a body or a geometric figure rotates or may be supposed to rotate, tides - the alternate rising and falling of the surface of the ocean and of water bodies (such as gulfs and bays) connected with the ocean that occurs usually twice a day and is the result of differing gravitational forces exerted at different parts of the earth by another body (such as the moon or sun), seasons - the period normally characterized by a particular kind of weather, orbit - a circular path, gravity - the gravitational attraction of the mass of the earth, the moon, or a planet for bodies at or near its surface, eccentricity - the eccentricity of an astronomical orbit used as a measure of its deviation from circularity, foci - a center of activity, attraction, or attention, day - the period of rotation of a planet (such as earth) or a moon on its axis, night - the time from dusk to dawn when no sunlight is visible, weather patterns - a consistent state of weather conditions in a specific area over a period of time, bary center - center of mass,

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