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new moon vs. full moon

new moon

noun
  1. the moon either when in conjunction with the sun or soon after, being either invisible or visible only as a slender crescent.
  2. the phase of the moon at this time.

full moon

noun
  1. the moon when the whole of its disk is illuminated, occurring when in opposition to the sun.
  2. the phase of the moon at this time.

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