Full moons occur when the sun and moon are in opposite signs at the same degree and minute, creating a sense of tension. Full moons represent culmination and fulfillment, and they illuminate what is hidden. Cancer is a water sign. They value relationships, emotional fulfillment, home, and family. Water signs help the rest of us reach emotional maturity and learn to value what is less direct and substantive. Especially potent during a Cancer full moon is our need to speak our truth, draw close to the ones we love, and reassess what is really important in life.