1. The user asked about the term "full moon" which is a concept in astronomy, not a math problem. 2. Since this is a non-math question, I will provide a short, friendly explanation. 3. A full moon occurs when the moon is on the opposite side of the Earth from the sun, making the entire face of the moon visible and illuminated. 4. This phase appears as a complete circle in the night sky and is the brightest phase of the moon. 5. There is no mathematical formula or graph related to this concept.