It's called the blueprint that describes the Earth's orbit around the Sun (revolution motion). Since there is no space above or below, left or right, has taken the Earth with his movements as a reference point.
The other planets have an orbit of the solar system - like the earth - more or less on its own plan (grade more, can not). Two more bodies that deviate from this plan at an angle substantially different are the first, Mercury (7 °), and the last, Pluto (17 °), but recently it has been excluded from the category planets. The rotation of the sun is the force that brings together all the gravity bodies that revolve around organized on the same plane.
The ecliptic is inclined to the axis of Earth's rotation on its axis (from pole to pole). And 'why from our point of view of the ecliptic appears tilted and it is this inclination (23 ° approximately), which helps the phenomenon in which the stars as the sun and moon rise and set, instead of remaining always revolve around at a fixed height (perpendicular to the equator on the head, and still on the horizon at the poles).
What a mess, my head is spinning ... a bit 'oblique!
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