The star at the center of our solar system, which provides Earth with light and heat.
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Earth's natural satellite, which orbits our planet and reflects sunlight.
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A round, three-dimensional model that represents Earth.
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A part of the year with its own weather pattern: winter, spring, summer, or fall.
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How directly sunlight strikes a part of Earth's surface. A more direct hit concentrates light and heat into a smaller area.
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An imaginary line through the center of Earth from the North Pole to the South Pole. Earth spins around it.
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Having an oval shape, like the path Earth follows around the Sun.
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An imaginary line around the middle of Earth, halfway between the poles.
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Half of Earth, such as the northern half or southern half.
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The curved path of one object around another in space, maintained by gravity.
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To travel in a path around another object, such as Earth traveling around the Sun.
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One full trip of an object around another object.
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To spin around one's own axis.
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Spinning around a center line.
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The light and heat energy that travels from the Sun to Earth.
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A slant or lean away from straight up and down.
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