summer solstice - longest day of the year for the northern hemisphere, winter solstice - shortest day of the year for the northern hemisphere, fall equinox - day with about 12 hours of day light in September, spring equinox - day with about 12 hours of day light in March, aphelion - point that we are farthest from the sun, approximately July 3, perihelion - point that we are closest to the sun, approximately January 3, rotation - spin of the Earth on its axis, makes day and night, revolution - movement of the Earth around the sun, makes years,

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