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sphere
a round, three-dimensional object
axis (for Earth)
the imaginary vertical line around which Earth spins
rotation (for Earth)
the spinning of Earth on its axis; causes day and night
24 hours
the time for one complete rotation of Earth
revolution (of Earth)
Earth's yearly orbit around the sun
ellipse
elongated, closed curve; oval-shaped orbit path of Earth
23.5 degrees
the amount Earth's axis is tilted; causes Earth to have seasons due to more or less direct rays
solstice
the day when the Sun reaches its greatest distance north or south of the equator
equinox
occurs when the Sun is directly above Earth's equator; equal day and night hours