The moon goes through eight phases during its orbit around Earth, which takes approximately 28 days. The phases include the new moon, waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, last quarter, and waning crescent. Each phase represents the degree to which the side of the moon facing Earth is illuminated by the sun, ranging from no illumination during a new moon to full illumination during a full moon.