Spacecraft
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Space technology
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Solar System
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Spaceflight
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Orbit
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Milankovitch cycles
Milankovich cycles
Kepler's laws
Kepler's third law
Kepler's first law
Kepler's laws of planetary motion
Orbital eccentricity
The orbital eccentricity of an astronomical object is a parameter that determines the amount by which its orbit around another body deviates from a perfect circle. A value of 0 is a circular orbit, va...
Orbital eccentricity - Wikipedia
Orbital eccentricity - Wikipedia