Assertion: moon's approach | /r/HasProperty | perigee
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Source sentences:
text: A SuperMoon is a perigee-syzygy, a new or full moon (syzygy) which occurs when the Moon is at 90% or greater of its mean closest approach to Earth (perigee).
text: When the Full Moon or New Moon occurs during the Moon's closest approach to Earth, its perigee, it is often called a supermoon.