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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The four yearly divisions of weather — winter, spring, summer, and fall — caused by the tilt of Earth's axis.
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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 an object that it spins around.
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Having an oval shape, like the path Earth follows around the Sun.
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An imaginary line circling the exact middle of Earth, equally distant from the North and South Poles.
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The northern and southern halves of Earth, divided by the equator.
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The curved path an object follows around another object in space.
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To travel in a path around another object, such as Earth traveling around the Sun.
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One complete trip an object makes around another object.
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To spin around one's own axis.
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One complete spin an object makes around its own axis.
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The light and heat energy that travels from the Sun to Earth.
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A lean away from a straight vertical line — Earth's axis leans about 23.5 degrees, which is why we have seasons.
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