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revolution
The movement of one object in a circular or elliptical path around another object.

orbit
The circular or elliptical path an object follows as it revolves around another object.

natural satellite
A naturally existing celestial body that revolves around a planet.

lunar cycle
Time period of the moon making one complete revolution of the Earth: 29.5 days

waxing
The 'growing' phases of the moon. During the waxing phases, the moon is illuminated on the right side in the northern hemisphere.

waning
The 'shrinking' phases of the moon. During the waning phases, the moon is illuminated on the left side in the northern hemisphere.

full moon
The phase of the moon in which the fully lighted face of the moon can be seen from the Earth. The moon and the sun are on opposite side of the Earth.

crescent moon
A phase of the moon in which only a sliver of the illuminated side of the moon can be seen from Earth. Waxing or waning.

gibbous moon
A phase of the moon in which more than half of the illuminated side of the moon can be seen from Earth. Waxing or waning.

quarter moon
A phase of the moon in which half of the illuminated side can be seen from Earth. First quarter is waxing and last quarter is waning.

new moon
The phase of the moon in which the moon is between the earth and the sun and cannon be seen in the sky as the illuminated side faces away from Earth.
