All planets in our solar system orbit the sun on the same plane, called the plane of the ecliptic.
- All planets in our solar system orbit the sun on the same plane, called the plane of the ecliptic.
- For an easier visual, here is only the Earth orbiting the sun in the plane of the ecliptic.
- The Earth is tilted on its axis and this is responsible for our seasons. The plane that slices through Earth at its equator is the plane of the celestial equator.
- The line formed by the intersection of the plane of the ecliptic and the plane of the celestial equator at the moment of the vernal equinox defines the beginning of springtime and the beginning of the area in space known as Aries. The other signs of the zodiac proceed from the Aries line, measuring 30 degrees for each sign and forming a 360-degree circle of 12 signs.
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