Definition of "perilune" [perilune]

• The point of an elliptical lunar orbit where the distance between the satellite and the Moon is at its minimum. (noun)

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• "China's first lunar probe, Chang'e-1, successfully completed its first braking at perilune and entered the moon's orbit Monday morning, becoming China's first circumlunar satellite."
• "A standard altimeter could not tell the astronauts when they reached their perilune because an altimeter was an instrument that determined altitude based on changes in atmospheric pressure and the Moon has no atmosphere."
• "Aldrin reported that DOI had come off extremely well, and that it had put Eagle into almost the exact, predetermined perilune from which it was to start its final, powered descent."