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The phase of the moon when it is more than half but less than fully illuminated is known as a gibbous moon. It appears to be more than half illuminated, but not completely round like a full moon. There are two types of gibbous moons:
1. Waxing Gibbous: This phase occurs between a first quarter moon and a full moon. The illuminated portion of the moon continues to increase, resulting in a crescent shape that is more than half but less than fully illuminated. The left side of the moon appears more illuminated during a waxing gibbous phase in the Northern Hemisphere.
2. Waning Gibbous: This phase occurs after a full moon and before a third quarter moon. The illuminated portion of the moon starts to decrease, resulting in a crescent shape that is more than half but less than fully illuminated. The right side of the moon appears more illuminated during a waning gibbous phase in the Northern Hemisphere.