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Egyptian god of the underworld
If you would colour the circle formed by the yearly passage of the earth around the sun yellow, and you then make this circle a lot bigger, you would find that all the other planets (except Pluto, who is no planet any longer, poor Pluto) are lying on this same frisbee. All the planets circle the sun on this same plane, called the plane of the ecliptic. Because of the earth's yearly revolution around the sun, the sun appears to move in an annual journey through the heavens with the ecliptic as its path.
The constellations through which the ecliptic passes are the constellations of the zodiac, the zone of the sky that includes about 8° on either side of the ecliptic.