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Eccentricity is a measure of how much an orbit deviates from being a perfect circle. It ranges from 0 (a perfect circle) to 1 (a parabolic trajectory).
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Semi-Major Axis: The longest diameter of an ellipse, half of which extends from the center to the furthest point on the edge.
Elliptical Orbit: An oval-shaped path followed by celestial bodies around a focal point due to gravitational forces.
Kepler's First Law: States that planets move in elliptical orbits with the Sun at one focus.