orbit, curved path of an object around a star or planet, axis, imaginary line from North Pole to the South Pole, star, a celestial body that appears as a luminous point in the sky, tide, rise and fall of the sea level, leap year, occurs every 4 years and has 366 days, universe, all of space and the energy contained in it, solar system, group of bodies that revolve around a star, waxing, getting bigger, waning , getting smaller, equinox, day and night of equal length, winter solstice, shortest day, summer solstice, longest day, spring tide, maximum difference between high and low tides, neap tide, minimum difference between high and low tides.

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