"Oberth effect" meaning in English

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        "The concept that the most efficient place for spacecraft to change velocity is at the periapsis (the lowest point of an orbit)."
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        "(astronautics) The concept that the most efficient place for spacecraft to change velocity is at the periapsis (the lowest point of an orbit)."
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        "(astronautics) The concept that the most efficient place for spacecraft to change velocity is at the periapsis (the lowest point of an orbit)."
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