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[mass noun] The point at which a spacecraft in lunar orbit is furthest from the moon.The opposite of perilune
- ‘The spacecraft consists of an orbiter which goes around the Moon at about 100 km altitude near a polar orbit, and a relay satellite on an elliptical orbit with initial apolune at 2,400 km.’
- ‘However, to be useful, the apolune must be located at one of the orbital nodes.’
- ‘This paper investigates the least maneuver velocity through the tolerable apolune and other lunar orbit elements.’
- ‘Having an apolune closer to the Moon would increase the efficiency for lunar mapping at higher resolutions than carried out by the Clementine and Lunar Prospector probes.’
- ‘The perilune slowly decreased to about 300 km and the apolune increased to about 3000 km, while the argument of perilune drifted around the south pole.’
1960s: from apo- + Latin luna moon, on the pattern of apogee.
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