What causes the change of phases of moon?

The phases of moon occur because of the relative position of earth and moon with respect to the sun. During a period of about a month or so, do the changes in position of the three bodies different parts of moon seem to be illuminated by the sunlight.
Following figure shows main five phases of moon out of thirty. It will help you to know and understand the phases.

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rotation of earth around sun and moon aroun earth is the reason

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