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autumnal equinox
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seasonal configuration of Earth and Sun
What causes the seasons?
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The orbits of the planets and other elements of the solar system, including asteroids, Kuiper belt, Oort cloud, comet
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Nicolaus Copernicus. Nicolas Copernicus (1473-1543) Polish astronomer. In 1543 he published, forward proof of a Heliocentric (sun centered) universe. Coloured stipple engraving published London 1802. De revolutionibus orbium coelestium libri vi.
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Colorful winter sunset
What's the Difference Between a Solstice and an Equinox?
Planet Earth and lunar moon from space
Where Did the Moon Come From?
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A human Inuit skull in a stone chambered cairn in Ilulissat in Greenland. These ancient graves are pre christian and are at least 2000
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autumnal equinox: Media

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Videos

What causes the seasons?
In many parts of the world, weather cycles through the four seasons like clockwork:...
Video: Encyclopædia Britannica, Inc.

Images

seasonal configuration of Earth and Sun
Earth's orbit around the Sun, with the positions of solstices and equinoxes.
Encyclopædia Britannica, Inc.
VIEW MORE in these related Britannica articles: