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transfer orbit

noun
1.
the flight path of a space vehicle moving from a nearly circular orbit to one with different parameters.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Article for transfer orbit

most economical path (though not the shortest or fastest) for a spacecraft to take from one planet to another. The German engineer Walter Hohmann showed in 1925 that elliptical orbits tangent to the orbits of both the planet of departure and the target planet require the least fuel and energy.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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