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an imaginary line through the center of an object

crescent moon

phase of the moon when only a thin shape is seen


the imaginary line that circles Earth halfway between the North and South poles

Full moon

phase of the moon when all the moon's bright side is seen

New moon

phase of the moon when the moon's bright side is not seen

phases of the moon

the different ways the moon looks throughtout the month


to move around another object

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